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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash Flows from Operating Activities    
Net loss $ (65,900) $ (46,507)
Adjustments to reconcile net loss to net cash and cash equivalents from operating activities:    
Depreciation and amortization 11,991 7,805
Amortization of right-of-use assets 642 566
Stock-based compensation expense 8,987 8,447
Change in fair value of warrant liabilities (1,793) (3,480)
Accretion of discounts on other long-term liabilities 52  
Amortization of premiums and accretion of discounts on marketable securities (6,260) (8,297)
Change in operating assets and liabilities that provided (used) cash and cash equivalents:    
Contract receivables (1,061) (1,403)
Contract receivables from related parties   (5,048)
Prepaid expenses and other assets 707 297
Accounts payable and other accrued liabilities (664) 207
Deferred revenue 6,734 (50)
Deferred revenue from related parties (828) (4,000)
Accrued compensation (2,027) 218
Operating lease liabilities (610) (406)
Net cash and cash equivalents used in operating activities (50,030) (51,651)
Cash Flows from Investing Activities    
Purchases of property, plant and equipment (11,236) (29,526)
Purchases of marketable securities and investments (174,040) (256,584)
Proceeds from sales of marketable securities and investments 252,177 315,493
Cash paid for note receivable to an independent contractor (4,448)  
Purchases of intangible assets (314) (428)
Net cash and cash equivalents provided by investing activities 62,139 28,955
Cash Flows from Financing Activities    
Payments of debt   (7)
Proceeds from exercise of stock options 232 194
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 (554) (111)
Repurchase of shares of common stock (8,274)  
Payments on finance lease liabilities (319) (259)
Net cash and cash equivalents provided by (used in) financing activities (8,677) 31
Net decrease in cash and cash equivalents 3,432 (22,665)
Cash and cash equivalents at beginning of period 34,537 50,123
Cash and cash equivalents at end of period 37,969 27,458
Supplemental information    
Cash paid for interest 37 39
Accrued capital expenditures $ 2,041 $ 2,309