Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Operations and Comprehensive Loss
Revenue	$ 15,446	$ 8,274	$ 4,245
Cost of revenue (excluding amortization of intangible assets)	5,870	4,547	1,713
Amortization of intangible assets	304	785
Gross profit	9,272	2,942	2,532
Operating expenses:
Sales and marketing	18,060	13,646	8,712
General and administrative	6,223	4,899	4,958
Research and development	4,151	4,339	5,786
Gain on litigation settlement		(2,160)
Total operating expenses	28,434	20,724	19,456
Loss from operations	(19,162)	(17,782)	(16,924)
Other (expense) income:
Interest expense	(3,609)	(1,802)	(4,558)
Loss on extinguishment of debt		(1,822)
Change in fair value of preferred stock warrant liability	(5)	244	54
Other income	351	70	94
Total other (expense) income	(3,263)	(3,310)	(4,410)
Net loss	(22,425)	(21,092)	(21,334)
Accretion of redeemable convertible preferred stock to redemption value	(7,783)	(8,823)	(5,893)
Net loss attributable to common stockholders	$ (30,208)	$ (29,915)	$ (27,227)
Net loss per common share, basic and diluted	$ (17.10)	$ (101.41)	$ (93.26)
Weighted average common shares outstanding, basic and diluted	1,766,412	294,988	291,963
Comprehensive loss:
Foreign currency translation adjustment	$ (15)
Unrealized loss on short-term investments	(4)
Comprehensive loss	$ (22,444)	$ (21,092)	$ (21,334)