Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Operations and Comprehensive Loss
Revenue	$ 18,213	$ 15,446	$ 8,274
Cost of revenue (excluding amortization of intangible assets)	6,675	5,870	4,547
Amortization of intangible assets	304	304	785
Gross profit	11,234	9,272	2,942
Operating expenses:
Sales and marketing	22,111	18,060	13,646
General and administrative	10,143	6,223	4,899
Research and development	4,255	4,151	4,339
Gain on litigation settlement			(2,160)
Total operating expenses	36,509	28,434	20,724
Loss from operations	(25,275)	(19,162)	(17,782)
Other (expense) income:
Interest expense	(3,564)	(3,609)	(1,802)
Loss on extinguishment of debt			(1,822)
Change in fair value of preferred stock warrant liability		(5)	244
Other income	45	351	70
Total other (expense) income	(3,519)	(3,263)	(3,310)
Net loss	(28,794)	(22,425)	(21,092)
Accretion of redeemable convertible preferred stock to redemption value		(7,783)	(8,823)
Net loss attributable to common stockholders	$ (28,794)	$ (30,208)	$ (29,915)
Net loss per common share, basic and diluted	$ (2.23)	$ (17.10)	$ (101.41)
Weighted average common shares outstanding, basic and diluted	12,934,421	1,766,412	294,988
Comprehensive loss:
Net loss	$ (28,794)	$ (22,425)	$ (21,092)
Foreign currency translation adjustment	(52)	(15)
Unrealized loss on short-term investments		(4)
Comprehensive loss	$ (28,846)	$ (22,444)	$ (21,092)