Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenues	$ 62,656	$ 52,776	$ 40,433
Cost of revenues	15,389	12,447	9,632
Gross Profit	47,267	40,329	30,801
Operating expenses:
Sales and marketing	42,993	38,264	27,900
General and administrative	17,457	13,667	8,572
Research and development	13,747	8,232	7,937
Total operating expenses	74,197	60,163	44,409
Loss from Operations	(26,930)	(19,834)	(13,608)
Other (income) expense:
Interest expense	3,685	3,688	2,808
Other (income) expense, net	(1,571)	575	(357)
Net Loss	$ (29,044)	$ (24,097)	$ (16,059)
Net loss per share of common stock outstanding, basic and diluted	$ (1.58)	$ (2.69)	$ (86.34)
Weighted-average common shares outstanding, basic and diluted	18,380	8,948	186