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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (26,851) $ (16,687)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 948 546
Amortization of debt discount and debt issuance costs 279 274
Non-cash interest expense 540 531
Deferred income taxes 148 (106)
Stock-based compensation 4,728 2,694
Changes in assets and liabilities:    
Accounts receivable, net (744) (3,195)
Prepaid expenses and other current assets 521 (708)
Other assets (167) (15)
Accounts payable (655) 986
Accrued and other current liabilities 984 1,596
Net cash used in operating activities (20,269) (14,084)
Cash flows from investing activities:    
Purchases of property and equipment (2,370) (455)
Purchase of other assets (50) 0
Net cash used in investing activities (2,420) (455)
Cash flows from financing activities:    
Proceeds from exercise of stock options 89 13
Proceeds from common stock issued under Employee Stock Purchase Plan 390 142
Proceeds from exercise of common stock warrants 32 18
Principal payment on capital lease obligations (525) (249)
Proceeds from Paycheck Protection Program loan 0 2,865
Repayment of Paycheck Protection Program loan 0 (2,865)
Proceeds from the issuance of common stock in public offering, gross 69,144 0
Net cash provided by (used in) financing activities 64,683 (97)
Net change in cash, cash equivalents and restricted cash 41,994 (14,636)
Cash, cash equivalents and restricted cash, beginning of period 57,548 72,184
Cash, cash equivalents and restricted cash, end of period 99,542 57,548
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 1,815 1,758
Supplemental disclosure of non-cash items:    
Equipment purchased under capital lease obligations 1,111 260
Costs incurred, but not paid, in connection with capital expenditures 685 553
Deferred offering costs included in accounts payable and accrued and other current liabilities 0 40
Deferred offering costs reclassified to equity 28 0
Public Offering    
Cash flows from financing activities:    
Payment of issuance costs related to public offering (4,407) 0
Other Offering    
Cash flows from financing activities:    
Payment of issuance costs related to public offering $ (40) $ (21)