Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 12,604	$ 7,851
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,102	1,962
Stock-based compensation	1,257	959
Fair value adjustment to contingent consideration obligations	42
Provision for doubtful accounts	146	104
Provision for inventory write-downs	170	184
Gain on divestitures	(5,876)
Foreign currency transaction loss	96	(20)
Changes in operating assets and liabilities:
Accounts receivable	(552)	(1,067)
Inventory and other deferred costs	(1,306)	(767)
Prepaid expenses and other assets	26	(756)
Accounts payable and other liabilities	(82)	(550)
Net cash provided by operating activities	8,627	7,900
Investing activities
Purchases of property and equipment and other assets	(1,230)	(2,444)
Purchases of short-term marketable securities	(10,757)
Proceeds from divestiture	7,400
Net cash used in investing activities	(4,587)	(2,444)
Financing activities
Payments of deferred acquisition consideration	(1,142)	(388)
Proceeds from issuance of common stock	738	2,301
Purchase of treasury stock	(5)
Common stock cash dividend paid	(2,704)	(2,065)
Net cash provided by financing activities	(3,113)	(152)
Effect of exchange rate changes on cash and cash equivalents	(385)	528
Net increase in cash and cash equivalents	542	5,832
Cash and cash equivalents at beginning of period	19,096	24,288
Cash and cash equivalents at end of period	$ 19,638	$ 30,120