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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities    
Net loss $ (32,933) $ (76,705)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 810 2,542
Amortization of finance lease right-of-use assets 10 423
Net accretion of premium and discount on investments (1,294) (689)
Investment income in unconsolidated variable interest entity (589) (796)
Loss on disposal of property and equipment 0 1
Stock-based compensation 8,762 16,112
Non-cash interest expense related to sale of future revenues 0 2,249
Impairment of investment 0 1,000
Realized loss on sales of available-for-sale securities 0 271
Changes in operating assets and liabilities:    
Accounts receivable, net (24,685) (1,299)
Inventories 13,786 (1,940)
Prepaid expenses and other current assets 5,271 38
Operating lease right-of-use assets 3,286 3,237
Other assets 219 1,072
Accounts payable (13,587) 40,473
Accrued and other liabilities (2,989) (66,266)
Operating lease liabilities, current 1,180 (371)
Deferred revenue (10,202) (18,877)
Accrued interest expense related to sale of future revenues (3,638) 0
Accrued interest for finance lease liabilities 14 (56)
Operating lease liabilities, non-current (4,001) (2,720)
Other long-term liabilities 1,292 710
Net cash used in operating activities (59,288) (101,591)
Investing activities    
Purchases of property and equipment (29) (591)
Purchases of available-for-sale securities (8,628) (2,472)
Proceeds from sales of available-for-sale securities 0 1,730
Proceeds from maturities of investments 59,933 104,815
Net cash provided by investing activities 51,276 103,482
Financing activities    
Repayments of finance lease liabilities (12) (71)
Repayments of lease obligations 0 (101)
Cash paid for payroll taxes on restricted stock unit releases (153) 0
Proceeds from issuance of common stock under ATM Program, net of commissions 0 30,750
Proceeds from issuance of common stock under employee stock plans 0 907
Net cash provided by (used in) financing activities (165) 31,485
Effect of exchange rate change on cash and cash equivalents 223 (526)
Net increase (decrease) in cash and cash equivalents (7,954) 32,850
Total cash and cash equivalents at beginning of period 113,688 155,700
Total cash and cash equivalents at end of period $ 105,734 $ 188,550