Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net income	$ 13,321	$ 16,918
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,975	3,108
Stock-based compensation	2,095	1,794
Fair value adjustment to contingent consideration obligations	123	(24)
Provision for doubtful accounts	289	209
Provision for inventory write-downs	508	298
Gain on divestitures		(5,876)
Foreign currency transaction loss	62	126
Changes in operating assets and liabilities:
Accounts receivable	268	1,552
Inventory and other deferred costs	(9,576)	(3,061)
Prepaid expenses and other assets	(449)	(1,764)
Accounts payable and other liabilities	(2,031)	(345)
Net cash provided by operating activities	8,585	12,935
Investing activities
Purchases of property and equipment and other assets	(2,361)	(1,764)
Purchases of short-term marketable securities	(18,378)	(15,948)
Sales of short-term marketable securities	7,000	13,000
Payments related to acquisitions	(6,815)	(11,000)
Proceeds from divestuture		7,400
Net cash used in investing activities	(20,554)	(8,312)
Financing activities
Payments of deferred acquisition consideration	(59)	(1,171)
Proceeds from issuance of common stock	3,138	2,809
Purchase of treasury stock	(446)	(678)
Common stock cash dividend paid	(5,035)	(4,073)
Net cash provided by financing activities	(2,402)	(3,113)
Effect of exchange rate changes on cash and cash equivalents	(228)	(502)
Net increase in cash and cash equivalents	(14,599)	1,008
Cash and cash equivalents at beginning of period	26,318	19,096
Cash and cash equivalents at end of period	$ 11,719	$ 20,104