Statement of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 232,780	$ 221,690	$ 181,218
Cost of Revenue	109,229	102,284	85,730
Gross Profit	123,551	119,406	95,488
Operating Expenses [Abstract]
Research and Development Expense	44,964	41,233	40,576
Selling, General and Administrative Expense	38,562	43,235	53,799
Amortization of Intangible Assets	2,320	2,145	2,422
Gain (Loss) Related to Litigation Settlement	(14,643)	0	0
Operating Expenses	71,203	86,613	96,797
Operating Income (Loss)	52,348	32,793	(1,309)
Interest Income (Expense), Net	2,834	5,688	5,317
Other Nonoperating Expense (Income)	(354)	293	65
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	49,868	26,812	(6,691)
Income Tax Expense (Benefit)	12,916	8,856	(2,051)
Net Income (Loss) Attributable to Parent	$ 36,952	$ 17,956	$ (4,640)
Earnings Per Share, Basic	$ 1.19	$ 0.57	$ (0.14)
Earnings Per Share, Diluted	$ 1.16	$ 0.56	$ (0.14)
Weighted Average Number of Shares Outstanding, Basic	31,128	31,408	33,124
Weighted Average Number of Shares Outstanding, Diluted	31,790	32,166	33,124