CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net revenue	$ 32,308	$ 19,115
Cost of revenue	15,140	9,898
Gross profit	17,168	9,217
Operating expenses
Research and development	4,910	3,362
Sales and marketing	13,900	13,317
General and administrative	8,059	5,251
Total operating expenses	26,869	21,930
Loss from operations	(9,701)	(12,713)
Other (expense) income
Foreign currency gain (loss)	(70)	24
Interest income	29	125
Interest expense	(665)	(1,295)
Other		15
Net loss	(10,407)	(13,844)
Other comprehensive income (loss):
Foreign currency translation adjustments	11	(71)
Total other comprehensive income (loss)	11	(71)
Total comprehensive loss	$ (10,396)	$ (13,915)
Net loss per share - basic and diluted	$ (0.40)	$ (0.66)
Weighted-average number of shares used in calculating net loss per share, basic and diluted	25,796,065	20,882,949