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Unaudited Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (8,926) $ (5,489)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 253 363
Amortization of debt discount and debt issuance costs 132 393
Non-cash interest expense 263 320
Revaluation of warrant liabilities 0 (467)
Deferred income taxes (117) 0
Loss on disposal of assets 0 217
Stock-based compensation 1,078 23
Changes in assets and liabilities:    
Accounts receivable, net (1,548) (782)
Prepaid expenses and other current assets 951 234
Other assets (1) 23
Accounts payable (42) (173)
Accrued and other liabilities (100) 1,220
Net cash used in operating activities (8,057) (4,118)
Cash flows from investing activities:    
Purchases of property and equipment (237) (375)
Proceeds from sale of property and equipment 0 300
Net cash used in investing activities (237) (75)
Cash flows from financing activities:    
Proceeds from exercise of stock options 12 0
Proceeds from exercise of common stock warrants 18 0
Principal payment on capital lease obligations (120) (57)
Proceeds from Paycheck Protection Program loan 2,865 0
Repayment of Paycheck Protection Program loan (2,865) 0
Payments of deferred offering costs 0 (419)
Net cash (used in) provided by financing activities (90) 7,266
Net change in cash, cash equivalents and restricted cash (8,384) 3,073
Cash, cash equivalents and restricted cash, beginning of period 72,184 13,264
Cash, cash equivalents and restricted cash, end of period 63,800 16,337
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 875 1,095
Supplemental disclosure of non-cash items:    
Accretion to redemption value of redeemable convertible preferred stock 0 4,302
Equipment purchased under capital lease obligations 2 300
Costs incurred, but not paid, in connection with capital expenditures 4 5
Issuance costs included in accounts payable and accrued liabilities 0 475
Series G redeemable convertible preferred stock    
Cash flows from financing activities:    
Proceeds from issuance of Series G redeemable convertible preferred stock, net of issuance costs $ 0 $ 7,742