Statements of Income Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues	$ 67,418	$ 62,701	$ 128,097	$ 117,063
Cost of Revenue	31,962	28,508	60,773	53,825
Gross Profit	35,456	34,193	67,324	63,238
Operating Expenses [Abstract]
Research and Development Expense	12,146	11,879	24,156	24,325
Selling, General and Administrative Expense	10,110	9,488	19,778	18,987
Amortization of Intangible Assets	505	595	1,010	1,190
Gain (Loss) Related to Litigation Settlement	0	0	0	(14,632)
Operating Expenses	22,761	21,962	44,944	29,870
Operating Income (Loss)	12,695	12,231	22,380	33,368
Interest Income (Expense), Nonoperating, Net	223	(1,446)	414	(2,915)
Total other expenses (income)	166	192	435	299
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	12,752	10,593	22,359	30,154
Income Tax Expense (Benefit)	3,559	2,992	6,015	8,614
Net Income (Loss) Attributable to Parent	$ 9,193	$ 7,601	$ 16,344	$ 21,540
Earnings (Loss) Per Share, Basic	$ 0.29	$ 0.25	$ 0.52	$ 0.70
Earnings (Loss) Per Share, Diluted	$ 0.29	$ 0.24	$ 0.51	$ 0.68
Weighted Average Number of Shares Outstanding, Basic	31,501	30,779	31,397	30,869
Weighted Average Number of Shares Outstanding, Diluted	32,146	31,754	32,104	31,705