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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (7,688) $ (10,272)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 553 283
Amortization of debt discount and debt issuance costs 42 38
Non-cash interest expense 137 135
Loss on disposal of assets 55 0
Non-cash lease expense 234 219
Stock-based compensation 986 1,376
Changes in assets and liabilities:    
Accounts receivable, net (3,226) (1,257)
Prepaid expenses and other current assets (86) 664
Other assets (79) (273)
Operating lease liabilities (250) (155)
Accounts payable (1,320) 579
Accrued and other current liabilities 893 89
Net cash used in operating activities (9,749) (8,574)
Cash flows from investing activities:    
Purchases of property and equipment (396) (1,087)
Net cash used in investing activities (396) (1,087)
Cash flows from financing activities:    
Proceeds from exercise of stock options 27 0
Payments of taxes withheld on vested restricted stock units 0 (115)
Proceeds from common stock issued under Employee Stock Purchase Plan 152 231
Principal payments on finance lease obligations (189) (146)
Principal payment on note payable obligations (52) 0
Net cash used in financing activities (62) (30)
Net change in cash, cash equivalents and restricted cash (10,207) (9,691)
Cash, cash equivalents and restricted cash, beginning of period 62,591 99,542
Cash, cash equivalents and restricted cash, end of period 52,384 89,851
Supplemental disclosure of cash flow information:    
Cash paid for interest 449 424
Supplemental disclosure of non-cash items:    
Equipment purchased under notes payable obligations 250 0
Costs incurred, but not paid, in connection with capital expenditures $ 199 $ 1,672