CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements Of Operations [Abstract]
Revenue	$ 73,096	$ 60,679
Cost of revenue	30,675	28,811
Gross profit	42,421	31,868
Operating expenses:
Research and development	11,783	12,010
Selling, general and administrative	12,793	9,668
Amortization	380	505
Total operating expenses	24,956	22,183
Operating income	17,465	9,685
Interest income, net	(391)	(191)
Other expense	182	269
Income before income taxes	17,674	9,607
Provision for income taxes	2,544	2,456
Net income	$ 15,130	$ 7,151
Earnings per share:
Basic	$ 0.48	$ 0.23
Diluted	$ 0.47	$ 0.22
Weighted average shares outstanding:
Basic	31,662	31,290
Diluted	32,317	32,058