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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (39,660) $ (49,706)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 452 578
Amortization of debt discount and issuance costs 890 1,462
Amortization of right-of-use asset 537 613
Change in fair value of warrant liability (338) (1,803)
Loss on disposal of property, machinery, equipment and intangible assets 17 69
Stock-based compensation expense 4,297 5,247
Non-cash consulting expense 112 0
Changes in operating assets and liabilities:    
Accounts receivables (434) 0
Prepaids and other current assets 3,401 1,914
Other non-current assets (337) (585)
Accounts payable 258 (742)
Accrued liabilities (1,298) (2,555)
Accrued interest 79 53
Other current liabilities 1 (6)
Contract liabilities (648) 133
Lease liability (569) (626)
Other non-current liabilities 12 11
Net cash used in operating activities (33,228) (45,943)
Cash flows from investing activities:    
Purchases of property, machinery and equipment (53) (488)
Proceeds from sale of property, machinery and equipment 63 7
Purchases of intangible assets (25) (464)
Net cash used in investing activities (15) (945)
Cash flows from financing activities:    
Proceeds from exercise of stock options 130 393
Proceeds from employee stock purchase plan 31 190
Repurchase of Section 16 Officer shares for tax coverage exchange (60) (97)
Principal payments on loan payable (6,298) (3,763)
Payment of deferred offering costs (121) 0
Payment for repurchase of common shares (10,000) 0
Proceeds from issuance of common stock and related warrants 10,000 0
Payments for issuance costs related to common stock and related warrants (700) 0
Net cash used in financing activities (7,018) (3,277)
Decrease in cash, cash equivalents and restricted cash (40,261) (50,165)
Cash, cash equivalents and restricted cash, beginning of period 62,413 160,547
Cash, cash equivalents and restricted cash, end of period 22,152 110,382
Supplemental disclosure of non-cash investing and financing activities    
Purchases of property, machinery and equipment in accounts payable and accrued expenses at period end 41 0
Deferred offering costs in accounts payable and accrued expenses at period end 16 0
Stock repurchase liability fair value 0 5,780
Supplemental disclosure of cash flow information    
Cash paid for interest $ 684 $ 1,392