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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS        
Revenue $ 2,378 $ 3,105 $ 8,516 $ 8,632
Cost of revenue 1,174 834 3,822 1,940
Total gross profit 1,204 2,271 4,694 6,692
Operating expenses:        
Research and development 12,752 13,056 36,093 39,981
Selling, general and administrative 5,798 6,047 18,617 20,808
Restructuring 0 0 0 991
Total operating expenses 18,550 19,103 54,710 61,780
Loss from operations (17,346) (16,832) (50,016) (55,088)
Other income (expense), net        
Interest expense (733) (1,473) (2,809) (4,511)
Interest income 1,226 1,263 3,567 3,746
Change in fair value of derivative warrant liabilities 1,200 (3,442) 717 (4,320)
Change in fair value of earn-out liabilities 820 (1,731) 514 (2,362)
Total other income (expense), net 2,513 (5,383) 1,989 (7,447)
Net loss before provision for income taxes (14,833) (22,215) (48,027) (62,535)
Provision for income taxes 0 0 0 0
Net loss $ (14,833) $ (22,215) $ (48,027) $ (62,535)
Net loss per share attributable to common stockholders-basic (in $ per share) $ (0.08) $ (0.17) $ (0.28) $ (0.48)
Net loss per share attributable to common stockholders-diluted (in $ per share)     $ (0.28) $ (0.48)
Weighted average shares used in computing net loss per share attributable to common stockholders - basic (in shares) 188,389 133,866 170,665 129,173
Weighted average shares used in computing net loss per share attributable to common stockholders - diluted (in shares)     170,665 129,173