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Unaudited Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (5,563) $ (2,704)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 126 182
Amortization of debt discount and debt issuance costs 65 201
Deferred income taxes (117) 0
Non-cash interest expense 131 159
Loss on disposal of assets 0 4
Stock-based compensation 431 12
Changes in assets and liabilities:    
Accounts receivable, net (128) (487)
Prepaid expenses and other current assets 367 378
Other assets (14) 0
Accounts payable 1,054 145
Accrued and other liabilities 347 160
Net cash used in operating activities (3,301) (1,950)
Cash flows from investing activities:    
Purchases of property and equipment (84) (363)
Net cash used in investing activities (84) (363)
Cash flows from financing activities:    
Proceeds from sale of common stock upon exercise of stock options 10 0
Principal payment on capital lease obligations (61) (20)
Payments of deferred offering costs 0 (274)
Net cash (used in) provided by financing activities (51) 3,476
Net change in cash, cash equivalents and restricted cash (3,436) 1,163
Cash, cash equivalents and restricted cash, beginning of period 72,184 13,264
Cash, cash equivalents and restricted cash, end of period 68,748 14,427
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 432 502
Supplemental disclosure of non-cash items:    
Accretion to redemption value of redeemable convertible preferred stock 0 2,114
Equipment Purchased Under Capital Lease 2 0
Cost incurred, but not paid, in connection with capital expenditures 37 12
Deferred offering costs included in accounts payable and accrued liabilities 0 750
Series G redeemable convertible preferred stock    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs $ 0 $ 3,770