CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements Of Operations [Abstract]
Revenue	$ 60,892	$ 73,096
Cost of revenue	28,873	30,675
Gross profit	32,019	42,421
Operating expenses:
Research and development	12,718	11,783
Selling, general and administrative	11,306	12,793
Amortization	387	380
Total operating expenses	24,411	24,956
Operating income	7,608	17,465
Interest income, net	(806)	(391)
Other (income) expense, net	(381)	182
Income before income taxes	8,795	17,674
Provision for income taxes	1,219	2,544
Net income	$ 7,576	$ 15,130
Earnings per share:
Basic	$ 0.25	$ 0.48
Diluted	$ 0.24	$ 0.47
Weighted average shares outstanding:
Basic	30,916	31,662
Diluted	31,266	32,317