Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue, net	$ 63,535	$ 48,334
Cost of revenue	16,063	11,773
Gross profit	47,472	36,561
Operating expenses:
Research and development	8,415	6,699
Selling, general and administrative	48,230	38,066
Total operating expenses	56,645	44,765
Loss from operations	(9,173)	(8,204)
Interest expense	(380)	(409)
Other income, net	505	375
Loss before income taxes	(9,048)	(8,238)
Income tax provision	17	12
Net loss	$ (9,065)	$ (8,250)
Net loss per common share, basic and diluted (in USD per share)	$ (0.34)	$ (0.34)
Weighted-average shares, basic and diluted (in shares)	26,839,870	24,474,308