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Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]    
Revenue $ 41,975 $ 40,387
Operating expenses:    
Costs of revenue 16,559 18,808
Selling, general and administrative expenses 37,033 28,702
Research and development expenses 3,568 2,176
Total operating expenses 57,160 49,686
Loss from operations (15,185) (9,299)
Interest expense (2,565) (3,491)
Change in fair value of financial instruments 0 267
Other income, net 984 510
Loss before income taxes (16,766) (12,013)
Income tax benefit (expense) 79 (25)
Net loss (16,687) (12,038)
Accretion of redeemable convertible preferred stock 0 (4,640)
Deemed dividend recorded in connection with financing transactions 0 (13,601)
Net loss attributable to common stockholders $ (16,687) $ (30,279)
Net loss per share, basic and diluted (USD per share) $ (1.32) $ (8.46)
Weighted-average number of shares used to compute net loss per share, basic and diluted (in shares) 12,632,780 3,578,771