CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue, net	$ 118,166	$ 83,490	$ 56,112
Revenue, net, type	us-gaap:ProductMember us-gaap:ServiceMember	us-gaap:ProductMember us-gaap:ServiceMember	us-gaap:ProductMember us-gaap:ServiceMember
Cost of revenue	$ 61,461	$ 47,429	$ 28,637
Cost of revenue, type	us-gaap:ProductMember us-gaap:ServiceMember	us-gaap:ProductMember us-gaap:ServiceMember	us-gaap:ProductMember us-gaap:ServiceMember
Gross profit	$ 56,705	$ 36,061	$ 27,475
Operating expenses:
Research and development	30,942	20,273	13,623
Selling, general and administrative	32,307	22,592	17,461
Amortization of intangible assets	7,153	3,871	1,222
Acquisition related expenses	227	7,029
Impairment and other charges	1,694	2,680
Total operating expenses	72,323	56,445	32,306
Loss from operations	(15,618)	(20,384)	(4,831)
Other income (expense):
Interest expense, net	(10,964)	(3,791)	(753)
Other income (expense), net	(90)	2,656	(3)
Total other income (expense), net	(11,054)	(1,135)	(756)
Loss before provision for (benefit from) income taxes	(26,672)	(21,519)	(5,587)
Provision for (benefit from) income taxes	184	(79)	101
Net loss	$ (26,856)	$ (21,440)	$ (5,688)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.90)	$ (0.85)	$ (0.31)
Weighted average number of shares used in computing net loss per share:
Basic and diluted (in shares)	29,902,351	25,144,562	18,591,308