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Unaudited Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (12,619) $ (8,926)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 407 253
Amortization of debt discount and debt issuance costs 148 132
Non-cash interest expense 266 263
Deferred income taxes 0 (117)
Stock-based compensation 2,197 1,078
Changes in assets and liabilities:    
Accounts receivable, net 130 (1,548)
Prepaid expenses and other current assets 987 951
Other assets (13) (1)
Accounts payable (102) (42)
Accrued and other current liabilities (163) (100)
Net cash used in operating activities (8,762) (8,057)
Cash flows from investing activities:    
Purchases of property and equipment (881) (237)
Net cash used in investing activities (881) (237)
Cash flows from financing activities:    
Proceeds from exercise of stock options 79 12
Proceeds from common stock issued under Employee Stock Purchase Plan 175 0
Proceeds from exercise of common stock warrants 0 18
Principal payment on capital lease obligations (220) (120)
Proceeds from Paycheck Protection Program loan 0 2,865
Repayment of Paycheck Protection Program loan 0 (2,865)
Proceeds from the issuance of common stock in public offering, gross 69,144 0
Payment of issuance costs related to public offering (4,407) 0
Net cash provided by (used in) financing activities 64,771 (90)
Net change in cash, cash equivalents and restricted cash 55,128 (8,384)
Cash, cash equivalents and restricted cash, beginning of period 57,548 72,184
Cash, cash equivalents and restricted cash, end of period 112,676 63,800
Supplemental disclosure of cash flow information:    
Cash paid for interest expense 892 875
Supplemental disclosure of non-cash items:    
Equipment purchased under capital lease obligations 940 2
Costs incurred, but not paid, in connection with capital expenditures 91 4
Deferred offering costs reclassified to equity $ 28 $ 0