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Unaudited Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (6,209) $ (5,563)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 187 126
Amortization of debt discount and debt issuance costs 73 65
Non-cash interest expense 132 131
Deferred income taxes 0 (117)
Stock-based compensation 912 431
Changes in assets and liabilities:    
Accounts receivable, net 689 (128)
Prepaid expenses and other current assets 1,061 367
Other assets (48) (14)
Accounts payable (792) 1,054
Accrued and other current liabilities (317) 347
Net cash used in operating activities (4,312) (3,301)
Cash flows from investing activities:    
Purchases of property and equipment (167) (84)
Net cash used in investing activities (167) (84)
Cash flows from financing activities:    
Proceeds from exercise of stock options 44 10
Proceeds from common stock issued under Employee Stock Purchase Pan 175 0
Principal payment on capital lease obligations (96) (61)
Proceeds from the issuance of common stock in public offering, gross 69,144 0
Payment of issuance costs related to public offering (4,186) 0
Net cash provided by (used in) financing activities 65,081 (51)
Net change in cash, cash equivalents and restricted cash 60,602 (3,436)
Cash, cash equivalents and restricted cash, beginning of period 57,548 72,184
Cash, cash equivalents and restricted cash, end of period 118,150 68,748
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 439 432
Supplemental disclosure of non-cash items:    
Equipment purchased under capital lease obligations 384 2
Costs incurred, but not paid, in connection with capital expenditures 44 37
Issuance costs included in accounts payable and accrued liabilities 221 0
Deferred offering costs reclassified to equity $ 28 $ 0