Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 16,918	$ 12,893
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,108	2,966
Stock-based compensation	1,794	1,845
Fair value adjustment to contingent consideration obligations	(24)
Provision for doubtful accounts	209	152
Provision for inventory write-downs	298	272
Gain on divestitures	(5,876)
Foreign currency transaction (gain) loss	126	(34)
Changes in operating assets and liabilities:
Accounts receivable	1,552	(50)
Inventory and other deferred costs	(3,061)	(1,330)
Prepaid expenses and other assets	(1,764)	(1,403)
Accounts payable and other liabilities	(345)	787
Net cash provided by operating activities	12,935	16,098
Investing activities
Purchases of property and equipment and other assets	(1,764)	(4,780)
Purchases of short-term marketable securities	(15,948)
Sales of short-term marketable securities	13,000
Payments related to acquisitions	(11,000)
Proceeds from divestiture	7,400
Net cash used in investing activities	(8,312)	(4,780)
Financing activities
Payments of deferred acquisition consideration	(1,171)	(427)
Proceeds from issuance of common stock	2,809	5,470
Purchase of treasury stock	(678)	(778)
Common stock cash dividend paid	(4,073)	(3,119)
Net cash provided by (used in) financing activities	(3,113)	1,146
Effect of exchange rate changes on cash and cash equivalents	(502)	762
Net increase in cash and cash equivalents	1,008	13,226
Cash and cash equivalents at beginning of period	19,096	24,288
Cash and cash equivalents at end of period	$ 20,104	$ 37,514