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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:    
Net loss $ (12,038) $ (8,012)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 591 731
Amortization of debt discount and debt issuance costs 691 587
Non-cash interest expense 546 515
Revaluation of warrant liabilities (267) 318
Deferred income taxes 0 31
Loss on disposal of assets 20 6
Stock-based compensation 572 114
Changes in assets and liabilities:    
Accounts receivable, net 237 (2,262)
Prepaid expenses and other current assets (1,255) (781)
Other assets (24) (8)
Accounts payable 528 (824)
Accrued and other liabilities 688 284
Net cash used in operating activities (9,711) (9,301)
Cash flows from investing activities:    
Purchases of property and equipment (403) (199)
Proceeds from sale of property and equipment 300 0
Purchases of short-term investments 0 (2,000)
Maturities of short-term investments 0 2,000
Net cash used in investing activities (103) (199)
Cash flows from financing activities:    
Proceeds from sale of common stock upon exercise of stock options 4 0
Principal payment on capital lease obligations (138) (38)
Proceeds from issuance of 2017 Term Loan, net of issuance costs of $5 0 4,995
Proceeds from initial public offering, net of issuance costs and offering costs 50,444 0
Net cash provided by financing activities 68,734 11,423
Increase in cash, cash equivalents and restricted cash 58,920 1,923
Cash, cash equivalents and restricted cash, beginning of period 13,264 11,341
Cash, cash equivalents and restricted cash, end of period 72,184 13,264
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 2,288 1,730
Supplemental disclosure of non-cash items:    
Accretion to redemption value of redeemable convertible preferred stock 4,640 9,318
Equipment purchased under capital lease obligations 654 289
Fair value of warrant liabilities recorded as discount on debt 0 289
Costs incurred, but not paid, in connection with capital expenditures 0 331
Conversion of redeemable convertible preferred stock 138,906 0
Net exercise of common and preferred stock warrants 511 0
Issuance costs included in accounts payable and accrued liabilities 0 355
Reclassification of redeemable convertible preferred stock warrant liabilities as equity 726 0
Deemed dividend recognized for beneficial conversion features of Series H redeemable convertible preferred stock 6,741  
Adjustment upon adoption of ASC 606 0 3,086
Series F redeemable convertible preferred stock    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 0 2,716
Supplemental disclosure of non-cash items:    
Deemed dividend from issuance of Series F redeemable convertible preferred stock 0 1,152
Series G redeemable convertible preferred stock    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 7,742 3,750
Supplemental disclosure of non-cash items:    
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock 6,860 0
Conversion of Series G to Series H redeemable convertible preferred stock 11,875 0
Series H redeemable convertible preferred stock    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 10,682 0
Supplemental disclosure of non-cash items:    
Deemed dividend recognized for beneficial conversion features of Series H redeemable convertible preferred stock $ 6,741 $ 0