CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 11,681	$ 9,345	$ 8,170
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,334	4,594	4,020
Non-cash interest expense	2,274
Stock-based compensation expense	4,595	3,598	1,766
Deferred tax expense (benefit)	(4,092)	(118)	295
Loss on revaluation of contingent consideration	3,242	4,083	2,072
Gain on sale of fixed assets	(15)
Loss on disposal of assets	7	1	35
Changes in assets and liabilities:
Accounts receivable	(3,222)	(3,729)	(1,597)
Royalties and other receivables	(652)	158	6,557
Inventories	(6,163)	(6,149)	(860)
Prepaid expenses and other current assets	612	(277)	(820)
Accounts payable	(1,802)	3,024	2,288
Accrued liabilities	(4,038)	(1,592)	(2,489)
Long-term liabilities	(240)	2,115	(1,036)
Net cash provided by operating activities	7,521	15,053	18,401
Cash flows from investing activities:
Purchases of marketable securities	(23,700)	(20,168)	(27,508)
Redemptions of marketable securities	23,400	27,587	34,804
Acquisition of assets of Refine Technology, LLC			(21,236)
Increase of restricted cash			(250)
Proceeds from sale of fixed assets	45
Purchases of property, plant and equipment	(4,325)	(2,628)	(5,602)
Net cash provided by (used in) investing activities	(49,194)	4,791	(19,792)
Cash flows from financing activities:
Proceeds from issuance of senior convertible notes, net of issuance costs	111,070
Exercise of stock options	1,841	866	1,680
Payments of contingent consideration	(798)	(99)
Net cash provided by financing activities	112,113	767	1,680
Effect of exchange rate changes on cash and cash equivalents	(2,299)	(1,882)	(4,756)
Net increase (decrease) in cash and cash equivalents	68,141	18,729	(4,467)
Cash and cash equivalents, beginning of period	54,092	35,363	39,830
Cash and cash equivalents, end of period	122,233	54,092	35,363
Supplemental information:
Income taxes paid	3,993	$ 4,948	$ 2,547
Payment of contingent consideration in common stock	875
Common stock tendered for acquisition of Atoll GmbH	14,135
Atoll GmbH
Cash flows from investing activities:
Acquisition of assets, net of cash acquired	(8,767)
TangenX Technology Corporation
Cash flows from investing activities:
Acquisition of assets, net of cash acquired	$ (35,847)