CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net revenues	$ 78,002	$ 77,038	$ 223,870	$ 206,492
Cost of revenues	52,738	60,577	157,589	169,438
Gross profit	25,264	16,461	66,281	37,054
Operating expenses:
Research and development	8,165	7,397	25,247	24,949
Sales and marketing	7,375	5,453	20,430	18,186
General and administrative	7,510	5,441	21,423	16,238
Restructuring charges	2,588	4,071	2,588	14,927
Total operating expenses	25,638	22,362	69,688	74,300
Loss from operations	(374)	(5,901)	(3,407)	(37,246)
Other expense, net
Interest expense	(2,469)	(1,760)	(7,031)	(5,979)
Other income (expense)	(379)	623	(1,077)	1,771
Total other expense, net	(2,848)	(1,137)	(8,108)	(4,208)
Loss before income taxes	(3,222)	(7,038)	(11,515)	(41,454)
Income tax (provision) benefit	(248)	184	(821)	(798)
Net loss	$ (3,470)	$ (6,854)	$ (12,336)	$ (42,252)
Net loss per share:
Basic and diluted (in usd per share)	$ (0.03)	$ (0.08)	$ (0.13)	$ (0.52)
Shares used in per share calculation:
Basic and diluted (in shares)	102,798	84,862	97,257	81,993