CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net revenues	$ 180,057	$ 78,002	$ 414,301	$ 223,870
Cost of revenues	115,351	52,738	270,937	157,589
Gross profit	64,706	25,264	143,364	66,281
Operating expenses:
Research and development	11,085	8,165	29,213	25,247
Sales and marketing	9,551	7,375	26,038	20,430
General and administrative	9,895	7,510	28,358	21,423
Restructuring charges	469	2,588	1,468	2,588
Total operating expenses	31,000	25,638	85,077	69,688
Income (loss) from operations	33,706	(374)	58,287	(3,407)
Other expense, net
Interest income	894	321	1,698	568
Interest expense	(2,286)	(2,790)	(7,388)	(7,599)
Other expense, net	(943)	(379)	(6,904)	(1,077)
Total other expense, net	(2,335)	(2,848)	(12,594)	(8,108)
Income (loss) before income taxes	31,371	(3,222)	45,693	(11,515)
Provision for income taxes	(272)	(248)	(1,211)	(821)
Net income (loss)	$ 31,099	$ (3,470)	$ 44,482	$ (12,336)
Net income (loss) per share:
Basic (in USD per share)	$ 0.25	$ (0.03)	$ 0.39	$ (0.13)
Diluted (in USD per share)	$ 0.23	$ (0.03)	$ 0.35	$ (0.13)
Shares used in per share calculation:
Basic (in shares)	122,123	102,798	114,720	97,257
Diluted (in shares)	133,611	102,798	131,114	97,257