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Unaudited Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ (23,581) $ (12,619)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 597 407
Amortization of debt discount and debt issuance costs 78 148
Non-cash interest expense 272 266
Non-cash lease expense 514 0
Stock-based compensation 2,816 2,197
Changes in assets and liabilities:    
Accounts receivable, net 64 130
Prepaid expenses and other current assets 576 987
Other assets (201) (13)
Operating lease liabilities (382) 0
Accounts payable 751 (102)
Accrued and other current liabilities (1,232) (163)
Net cash used in operating activities (19,728) (8,762)
Cash flows from investing activities:    
Purchases of property and equipment (3,033) (881)
Net cash used in investing activities (3,033) (881)
Cash flows from financing activities:    
Proceeds from exercise of stock options 0 79
Payments of taxes withheld on vested restricted stock units (222) 0
Proceeds from common stock issued under Employee Stock Purchase Plan 231 175
Principal payments on finance lease obligations (303) (220)
Proceeds from the issuance of common stock in public offering, gross 0 69,144
Payment of issuance costs related to public offering 0 (4,407)
Net cash (used in) provided by financing activities (294) 64,771
Net change in cash, cash equivalents and restricted cash (23,055) 55,128
Cash, cash equivalents and restricted cash, beginning of period 99,542 57,548
Cash, cash equivalents and restricted cash, end of period 76,487 112,676
Supplemental disclosure of cash flow information:    
Cash paid for interest 860 892
Supplemental disclosure of non-cash items:    
Equipment purchased under finance lease obligations 293 940
Costs incurred, but not paid, in connection with capital expenditures 391 91
Deferred offering costs reclassified to equity $ 0 $ 28