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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (16,687) $ (12,038)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 546 591
Amortization of debt discount and debt issuance costs 274 691
Non-cash interest expense 531 546
Revaluation of warrant liabilities 0 (267)
Deferred income taxes (106) 0
Loss on disposal of assets 0 20
Stock-based compensation 2,694 572
Changes in assets and liabilities:    
Accounts receivable, net (3,195) 237
Prepaid expenses and other current assets (708) (1,255)
Other assets (15) (24)
Accounts payable 986 528
Accrued and other current liabilities 1,596 688
Net cash used in operating activities (14,084) (9,711)
Cash flows from investing activities:    
Purchases of property and equipment (455) (403)
Proceeds from sale of property and equipment 0 300
Net cash used in investing activities (455) (103)
Cash flows from financing activities:    
Proceeds from sale of common stock upon exercise of stock options 13 4
Proceeds from common stock issued under Employee Stock Purchase Plan 142 0
Proceeds from exercise of common stock warrants 18 0
Principal payment on capital lease obligations (249) (138)
Proceeds from Paycheck Protection Program loan 2,865 0
Repayment of Paycheck Protection Program loan (2,865) 0
Proceeds from initial public offering, net of issuance costs and offering costs 0 50,444
Payments of deferred offering costs (21) 0
Net cash (used in) provided by financing activities (97) 68,734
Net change in cash, cash equivalents and restricted cash (14,636) 58,920
Cash, cash equivalents and restricted cash, beginning of period 72,184 13,264
Cash, cash equivalents and restricted cash, end of period 57,548 72,184
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 1,758 2,288
Supplemental disclosure of non-cash items:    
Accretion to redemption value of redeemable convertible preferred stock 0 4,640
Equipment purchased under capital lease obligations 260 654
Costs incurred, but not paid, in connection with capital expenditures 553 0
Conversion of redeemable convertible preferred stock 0 138,906
Net exercise of common and preferred stock warrants 0 511
Deferred offering costs included in accounts payable and accrued and other current liabilities 40 0
Reclassification of redeemable convertible preferred stock warrant liabilities as equity 0 726
Deemed dividend recognized for beneficial conversion features of Series H redeemable convertible preferred stock   6,741
Series G redeemable convertible preferred stock    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 0 7,742
Supplemental disclosure of non-cash items:    
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock 0 6,860
Conversion of Series G to Series H redeemable convertible preferred stock 0 11,875
Series H redeemable convertible preferred stock    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 0 10,682
Supplemental disclosure of non-cash items:    
Deemed dividend recognized for beneficial conversion features of Series H redeemable convertible preferred stock $ 0 $ 6,741