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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities    
Net loss $ (76,288) $ (18,821)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on forward sale of Series B Preferred Stock 37,792 0
Unrealized loss on Bridge Loans 10,655 0
Stock-based compensation expense 4,042 3,677
Amortization of developed technology 2,968 2,983
Depreciation and amortization 1,003 934
Provision for excess and obsolete inventory 851 315
Amortization of debt discounts, premiums and issuance costs 211 132
Other non-cash items 104 163
Changes in assets and liabilities:    
Accounts receivable, net 2,917 9,843
Inventories, net (3,558) (2,896)
Prepaid expenses and other assets (38) (2,763)
Accounts payable 1,905 3,363
Accrued compensation and related benefits 3,037 (5,020)
Deferred revenue 155 156
Other liabilities (1,346) (4,967)
Net cash used in operating activities (15,590) (12,901)
Investing activities    
Proceeds from NIH Contract 0 2,000
Purchases of property and equipment (868) (6,923)
Net cash used in investing activities (868) (4,923)
Financing activities    
Proceeds from bridge loans 25,000 0
Repayment of advances under credit agreement (6,838) 0
Repayment of long-term debt 0 (501)
Payments for taxes related to net share settlement of equity awards and other (87) (525)
Net cash provided by (used in) financing activities 18,075 (1,026)
Effect of foreign exchange rate fluctuations on cash and cash equivalents (85) 74
Net increase (decrease) in cash, cash equivalents and restricted cash 1,532 (18,776)
Cash, cash equivalents and restricted cash at beginning of period 29,467 69,536
Cash, cash equivalents and restricted cash at end of period 30,999 50,760
Supplemental disclosures of cash flow information    
Cash paid for interest 102 44
Cash paid for income taxes, net of refunds 488 1,200
Non-cash right-of-use assets and lease liabilities (133) 0
Asset retirement obligations $ 722 $ 324