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Unaudited Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 10,775	$ 10,439	$ 29,307	$ 30,173
Operating expenses:
Costs of revenue	4,341	4,783	12,224	14,217
Selling, general and administrative expenses	9,202	7,306	27,104	20,787
Research and development expenses	1,018	507	2,403	1,610
Total operating expenses	14,561	12,596	41,731	36,614
Loss from operations	(3,786)	(2,157)	(12,424)	(6,441)
Interest expense	(647)	(909)	(1,913)	(2,720)
Change in fair value of financial instruments	0	(200)	0	267
Other income, net	125	125	985	264
Loss before income taxes	(4,308)	(3,141)	(13,352)	(8,630)
Income tax benefit	0	0	118	0
Net loss	(4,308)	(3,141)	(13,234)	(8,630)
Accretion of redeemable convertible preferred stock	0	(338)	0	(4,640)
Deemed dividend recorded in connection with financing transactions	0	(13,601)	0	(13,601)
Net loss attributable to common stockholders (Note 2)	$ (4,308)	$ (17,080)	$ (13,234)	$ (26,871)
Net loss per share, basic and diluted (USD per share)	$ (0.34)	$ (11.29)	$ (1.05)	$ (48.70)
Weighted-average number of shares used to compute net loss per share, basic and diluted (in shares)	12,644,348	1,513,189	12,626,259	551,730

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