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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash Flows from Operating Activities    
Net loss $ (43,481) $ (31,365)
Adjustments to reconcile net loss to net cash and cash equivalents from operating activities:    
Depreciation and amortization 7,974 4,906
Amortization of right-of-use assets 417 372
Stock-based compensation expense 5,914 5,145
Change in fair value of warrant liabilities (202) (2,325)
Accretion of discounts on other long-term liabilities 24  
Amortization of premiums and accretion of discounts on marketable securities (4,540) (5,518)
Change in operating assets and liabilities that provided (used) cash and cash equivalents:    
Contract receivables (6,213) (1,232)
Contract receivables from related parties (4,581) (2,151)
Prepaid expenses and other assets (2,287) (188)
Accounts payable and other accrued liabilities 884 (297)
Deferred revenue 10,075 (32)
Deferred revenue from related parties (828) (4,000)
Accrued compensation (3,030) 649
Operating lease liabilities (305) (268)
Net cash and cash equivalents used in operating activities (40,179) (36,304)
Cash Flows from Investing Activities    
Purchases of property, plant and equipment (8,460) (21,184)
Purchases of marketable securities and investments (99,548) (174,400)
Proceeds from sales of marketable securities and investments 156,135 210,329
Cash paid for note receivable to an independent contractor (3,046)  
Purchases of intangible assets (270) (259)
Net cash and cash equivalents provided by investing activities 44,811 14,486
Cash Flows from Financing Activities    
Payments of debt   (7)
Proceeds from exercise of stock options 197 184
Proceeds from issuance of shares of common stock under the ESPP 238 214
Cash paid for withholding of employee taxes related to stock-based compensation (479) (111)
Repurchase of shares of common stock (8,274)  
Payments on finance lease liabilities (213) (146)
Net cash and cash equivalents provided by (used in) financing activities (8,531) 134
Net decrease in cash and cash equivalents (3,899) (21,684)
Cash and cash equivalents at beginning of period 34,537 50,123
Cash and cash equivalents at end of period 30,638 28,439
Supplemental information    
Cash paid for interest 91 26
Accrued capital expenditures $ 744 $ 3,591