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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash Flows from Operating Activities    
Net loss $ (19,158) $ (10,344)
Adjustments to reconcile net loss to net cash and cash equivalents from operating activities:    
Depreciation and amortization 2,264 753
Amortization of right-of-use assets 183 9
Stock compensation expense 2,222 1,596
Deferred taxes   (23)
Warrant liabilities 2,662 (710)
Amortization of premiums and accretion of discounts on marketable securities (2,716)  
Change in operating assets and liabilities that provided (used) cash and cash equivalents:    
Contract receivable 140 (810)
Prepaid expenses and other assets (1,129) 659
Accounts payable (2,131) (3,310)
Deferred revenue (3,014) (69)
Accrued and other liabilities 1,178 (2,300)
Lease liabilities (132) 180
Net cash and cash equivalents used in operating activities (19,631) (14,369)
Cash Flows from Investing Activities    
Purchases of property, plant and equipment (11,581) (10,527)
Purchases of marketable securities and long-term investments (110,636) (61,669)
Proceeds from sales of marketable securities 101,665 23,420
Purchases of intangible assets (125) (105)
Net cash and cash equivalents used in investing activities (20,677) (48,881)
Cash Flows from Financing Activities    
Payments of debt (7) (38)
Proceeds from exercise of common stock options 150 270
Payments on finance lease liability (70) (12)
Transaction costs   (12)
Net cash and cash equivalents provided by financing activities 73 208
Net (decrease) increase in cash and cash equivalents (40,235) (63,042)
Cash and cash equivalents at beginning of period 50,123 513,447
Cash and cash equivalents at end of period 9,888 450,405
Supplemental information    
Cash paid for interest 13 3
Accrued capital expenditures $ 3,370 $ 3,119