Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Total revenues	$ 73,692	$ 50,321
Costs and expenses
Cost of sales (excludes amortization of intangible assets of $1,623 and $1,590, respectively)	23,570	19,249
Research and development	7,875	12,707
Sales and marketing	13,555	12,317
General and administrative	7,172	7,289
Amortization of intangible assets from acquired businesses and technology	2,291	2,219
Total costs and expenses	54,463	53,781
Operating income (loss)	19,229	(3,460)
Interest expense, net	(2,825)	(2,689)
Income (loss) before income taxes	16,404	(6,149)
Provision (benefit) for income taxes	2,114	(2,703)
Net income (loss)	$ 14,290	$ (3,446)
Basic earnings (loss) per share (in dollars per share)	$ 0.43	$ (0.11)
Diluted earnings (loss) per share (in dollars per share)	$ 0.42	$ (0.11)
Shares used in basic per share calculation (in shares)	33,202	32,727
Shares used in diluted per share calculation (in shares)	33,998	32,727