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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (39,219) $ (75,730)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 8,688 8,943
Non-cash lease expense 165 115
Foreign exchange remeasurement loss (gain) 162 (723)
Impairment of fixed assets 2,780 14,020
Impairment of right-of-use assets 187 7,596
Change in fair value of contingent consideration 196 (81)
Depreciation 1,968 2,767
Accretion on invested securities (2,411) (2,898)
Non-cash interest expense 503 509
Change in fair value of derivative financial instrument 888 120
Loss on disposals of property and equipment 292 335
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 2,504 (1,501)
Other long-term assets (901) (1,017)
Accounts payable 11 (227)
Operating lease liabilities (634) (539)
Accrued restructuring costs (75) (1,879)
Accrued expenses and other current liabilities (108) (4,032)
Net cash used in operating activities (25,004) (54,222)
Cash flows from investing activities:    
Purchase of marketable securities (91,081) (178,494)
Maturities of marketable securities 111,700 218,800
Purchases of property, plant and equipment 0 (15,447)
Cash received from held for sale assets 541 0
Net cash provided by investing activities 21,160 24,859
Cash flows from financing activities:    
Proceeds from note payable 0 8,669
Net cash provided by financing activities 0 8,669
Net decrease in cash, cash equivalents and restricted cash (3,844) (20,694)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (71) (97)
Cash, cash equivalents and restricted cash—beginning of period 10,696 43,716
Cash, cash equivalents and restricted cash—end of period 6,781 22,925
Supplemental disclosure of cash flow information:    
Cash paid for interest, net of amounts capitalized 3,482 3,154
Supplemental disclosure of noncash information:    
Purchases of property, plant and equipment in accounts payable and accrued expenses and other current liabilities $ 0 $ 4,815