CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 9,080	$ 8,569
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,449	2,965
Stock-based compensation expense	2,668	1,386
Deferred tax expense	218	261
Loss on revaluation of contingent consideration	2,114	126
Loss on disposal of assets	1	3
Bad debt reserve	11
Changes in assets and liabilities:
Accounts receivable	(2,767)	(763)
Other receivables	183	6,678
Inventories	(4,051)	(1,347)
Prepaid expenses and other current assets	699	88
Accounts payable	(749)	921
Accrued liabilities	1,085	(1,984)
Long-term liabilities	(240)	(255)
Net cash provided by operating activities	11,701	16,648
Cash flows from investing activities:
Purchases of marketable securities	(14,090)	(24,236)
Redemptions of marketable securities	18,264	30,117
Acquisition of assets of Refine Technology, LLC		(21,236)
Increase in restricted cash		(250)
Purchases of property, plant and equipment	(2,055)	(2,964)
Net cash provided by (used in) investing activities	2,119	(18,569)
Cash flows from financing activities:
Exercise of stock options	927	1,486
Payment of contingent considerations	(99)	(604)
Net cash provided by financing activities	828	882
Effect of exchange rate changes on cash and cash equivalents	(1,927)	(2,884)
Net increase (decrease) in cash and cash equivalents	12,721	(3,923)
Cash and cash equivalents, beginning of period	35,363	39,830
Cash and cash equivalents, end of period	48,084	35,907
Supplemental disclosure of non-cash investing activities:
Income taxes paid	$ 2,671	$ 671