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Unaudited Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (8,630) $ (6,695)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 480 576
Amortization of debt discount and debt issuance costs 575 425
Non-cash interest expense 484 380
Revaluation of warrant liabilities (267) (55)
Loss on disposal of assets 20 0
Stock-based compensation 85 100
Changes in assets and liabilities:    
Increase (Decrease) in Accounts Receivable (286) (1,168)
Increase (Decrease) in Prepaid Expense and Current Other Assets 510 (590)
Increase (Decrease) in Other Noncurrent Assets (24) (8)
Accounts payable 174 (392)
Accrued and other liabilities 1,095 (5)
Net cash used in operating activities (5,784) (7,432)
Cash flows from investing activities:    
Purchases of property and equipment (377) (128)
Proceeds from sale of property and equipment 300 0
Purchases of short-term investments 0 (2,000)
Maturities of short-term investments 0 1,000
Net cash used in investing activities (77) (1,128)
Cash flows from financing activities:    
Repayments of Long-term Capital Lease Obligations (94) (17)
Proceeds from initial public offering, net of issuance costs 52,195 0
Net cash provided by financing activities 70,525 2,699
Increase (decrease) in cash, cash equivalents and restricted cash 64,664 (5,861)
Cash, cash equivalents and restricted cash, beginning of period 13,264 11,341
Cash, cash equivalents and restricted cash, end of period 77,928 5,480
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 1,661 1,293
Supplemental disclosure of non-cash items:    
Accretion to redemption value of redeemable convertible preferred stock 4,640 6,462
Equipment Purchased Under Capital Lease 412 289
Cost incurred, but not paid, in connection with capital expenditures 71 207
Conversion of redeemable convertible preferred stock 138,906 0
Net exercise of common and preferred stock warrants 511 0
Deferred offering costs included in accounts payable and accrued liabilities 1,677 0
Reclassification of redeemable convertible preferred stock warrant liabilities as equity 726 0
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 0
Supplemental disclosure of non-cash items:    
Deemed dividend from conversion/issuance of 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