0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000007 - Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 0000008 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 0000009 - Disclosure - RESTRUCTURING link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - BALANCE SHEETS COMPONENTS link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - COMMON STOCK WARRANT LIABILITY link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - STOCKHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - STOCK-BASED AWARDS link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - EMPLOYEE BENEFIT PLAN link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 9954701 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9954702 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954703 - Disclosure - RESTRUCTURING (Tables) link:presentationLink link:calculationLink link:definitionLink 9954704 - Disclosure - BALANCE SHEETS COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954705 - Disclosure - FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954706 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 9954707 - Disclosure - COMMON STOCK WARRANT LIABILITY (Tables) link:presentationLink link:calculationLink link:definitionLink 9954708 - Disclosure - STOCKHOLDERS’ EQUITY (Tables) link:presentationLink link:calculationLink link:definitionLink 9954709 - Disclosure - STOCK-BASED AWARDS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954710 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954711 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954712 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9954713 - Disclosure - DESCRIPTION OF BUSINESS (Details) link:presentationLink link:calculationLink link:definitionLink 9954714 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9954715 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954716 - Disclosure - RESTRUCTURING - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954717 - Disclosure - RESTRUCTURING - Restructuring Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954718 - Disclosure - BALANCE SHEETS COMPONENTS - Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 9954719 - Disclosure - BALANCE SHEETS COMPONENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954720 - Disclosure - BALANCE SHEETS COMPONENTS - Property, Plant, and Equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 9954721 - Disclosure - BALANCE SHEETS COMPONENTS - Construction in Progress (Details) link:presentationLink link:calculationLink link:definitionLink 9954722 - Disclosure - BALANCE SHEETS COMPONENTS - Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954723 - Disclosure - BALANCE SHEETS COMPONENTS - Other Noncurrent Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954724 - Disclosure - BALANCE SHEETS COMPONENTS - Accrued Warranty Activities (Details) link:presentationLink link:calculationLink link:definitionLink 9954725 - Disclosure - FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities at Fair Value, Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9954725 - Disclosure - FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities at Fair Value, Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9954726 - Disclosure - FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954727 - Disclosure - FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Available-for-sale Debt Securities by Contractual Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9954728 - Disclosure - FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Reconciliation of Level 3 Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954729 - Disclosure - DEBT - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954730 - Disclosure - DEBT - Schedule of Carrying Values and Estimated Fair Values of Convertible Notes (Details) link:presentationLink link:calculationLink link:definitionLink 9954731 - Disclosure - DEBT - Components of Interest Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954732 - Disclosure - COMMON STOCK WARRANT LIABILITY - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954733 - Disclosure - COMMON STOCK WARRANT LIABILITY - Fair Value of Private Warrants (Details) link:presentationLink link:calculationLink link:definitionLink 9954734 - Disclosure - COMMON STOCK WARRANT LIABILITY - Level 3 Fair Value Inputs (Details) link:presentationLink link:calculationLink link:definitionLink 9954735 - Disclosure - STOCKHOLDERS’ EQUITY - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954736 - Disclosure - STOCKHOLDERS’ EQUITY - Common Stock Reserved for Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 9954737 - Disclosure - STOCK-BASED AWARDS - Schedule of Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954738 - Disclosure - STOCK-BASED AWARDS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954739 - Disclosure - STOCK-BASED AWARDS - Restricted Stock Award Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954740 - Disclosure - STOCK-BASED AWARDS - Valuation Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9954741 - Disclosure - STOCK-BASED AWARDS - Employee Stock Purchase Plan (Details) link:presentationLink link:calculationLink link:definitionLink 9954742 - Disclosure - STOCK-BASED AWARDS - Share-based Payment Arrangement, Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954743 - Disclosure - LEASES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954744 - Disclosure - LEASES - Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954745 - Disclosure - LEASES - Lease Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954746 - Disclosure - LEASES - Remaining Terms and Discount Rates (Details) link:presentationLink link:calculationLink link:definitionLink 9954747 - Disclosure - LEASES - Lease Liability Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9954747 - Disclosure - LEASES - Lease Liability Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9954748 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954749 - Disclosure - COMMITMENTS AND CONTINGENCIES - Schedule of Estimated Purchase Commitment (Details) link:presentationLink link:calculationLink link:definitionLink 9954750 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 9954751 - Disclosure - NET LOSS PER SHARE - Basic and Diluted Net Loss per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954752 - Disclosure - NET LOSS PER SHARE - Antidilutive Securities Excluded from Earnings per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954753 - Disclosure - NET LOSS PER SHARE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954754 - Disclosure - EMPLOYEE BENEFIT PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 9954755 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 9954756 - Disclosure - SUBSEQUENT EVENTS (Details) link:presentationLink link:calculationLink link:definitionLink