CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net revenue	$ 38,115	$ 30,559	$ 91,048	$ 84,826
Cost of revenue	19,291	15,049	45,649	42,491
Gross profit	18,824	15,510	45,399	42,335
Operating expenses
Research and development	3,979	4,745	13,466	12,002
Sales and marketing	20,465	15,932	47,169	44,107
General and administrative	7,262	6,047	23,948	16,925
Total operating expenses	31,706	26,724	84,583	73,034
Loss from operations	(12,882)	(11,214)	(39,184)	(30,699)
Other (expense) income
Foreign currency gain (loss)	(58)	38	(188)	37
Interest income	21	42	74	227
Interest expense	(647)	(1,308)	(1,960)	(3,898)
Other			18	15
Net loss	(13,566)	(12,442)	(41,240)	(34,318)
Other comprehensive income (loss):
Foreign currency translation adjustments	(40)	34	(22)	(41)
Total other comprehensive income (loss)	(40)	34	(22)	(41)
Total comprehensive loss	$ (13,606)	$ (12,408)	$ (41,262)	$ (34,359)
Net loss per share - basic and diluted	$ (0.52)	$ (0.49)	$ (1.59)	$ (1.48)
Weighted-average number of shares used in calculating net loss per share, basic and diluted	25,987,648	25,578,328	25,891,045	23,192,703