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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (23,689) $ (47,387)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,168 1,557
Amortization of debt discount and debt issuance costs 156 161
Non-cash interest expense 363 551
Deferred income taxes 0 (306)
Loss on disposal of assets 189 0
Loss on lease assignment 1,470 0
Non-cash lease expense 939 967
Long-lived assets impairment 0 397
Goodwill impairment 0 5,506
Stock-based compensation 3,617 4,704
Other 0 36
Changes in assets and liabilities:    
Accounts receivable, net (474) 3,577
Prepaid expenses and other current assets (654) (505)
Other assets (101) (47)
Operating lease liabilities (1,010) (854)
Accounts payable 67 901
Accrued and other current liabilities 2,497 (1,402)
Net cash used in operating activities (14,462) (32,144)
Cash flows from investing activities:    
Purchases of property and equipment (828) (4,318)
Proceeds from disposal of property and equipment 24 0
Net cash used in investing activities (804) (4,318)
Cash flows from financing activities:    
Proceeds from exercise of stock options 27 61
Payments of taxes withheld on vested restricted stock units 0 (239)
Proceeds from common stock issued under Employee Stock Purchase Plan 279 385
Principal payment on finance lease obligations (697) (667)
Principal payment on note payable obligations (241) (29)
Principal payment on long-term debt (10,000) 0
Net cash used in financing activities (10,632) (489)
Net change in cash, cash equivalents and restricted cash (25,898) (36,951)
Cash, cash equivalents and restricted cash, beginning of year 62,591 99,542
Cash, cash equivalents and restricted cash, end of year 36,693 62,591
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 1,737 1,732
Supplemental disclosure of non-cash items:    
Equipment purchased under finance lease obligations 0 741
Equipment purchased under notes payable obligations 250 807
Costs incurred, but not paid, in connection with capital expenditures $ 66 $ 182