CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net revenue	$ 19,115	$ 12,299
Cost of revenue	9,898	7,120
Gross profit	9,217	5,179
Operating expenses
Research and development	3,362	3,273
Sales and marketing	13,317	9,161
General and administrative	5,251	4,879
Total operating expenses	21,930	17,313
Loss from operations	(12,713)	(12,134)
Other (expense) income
Foreign currency gain (loss)	24	(9)
Interest income	125	203
Interest expense	(1,295)	(1,024)
Other	15
Net loss	(13,844)	(12,964)
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(71)
Total other comprehensive loss	(71)
Total comprehensive loss	$ (13,915)	$ (12,964)
Net loss per share attributable to common stockholders - basic and diluted	$ (0.66)	$ (0.76)
Weighted-average number of shares used in calculating net loss per share, basic and diluted	20,882,949	16,949,027