Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net income (loss) from continuing operations	$ 720	$ (8,229)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,913	1,994
Intangible asset amortization	872	908
Stock-based compensation	2,458	3,069
Loss on disposal/sale of property and equipment	18	4
Restructuring costs	(88)	112
Deferred tax provision	(282)	6,332
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	710	2,946
Inventories	1,809	2,793
Prepaid expenses and other assets	509	306
Accounts payable	(1,078)	(1,360)
Income taxes payable	(154)	(153)
Other accrued liabilities	(426)	(857)
Deferred revenue	95	12
Net cash provided by operating activities	7,076	7,877
Investing Activities:
Capital expenditures	(2,097)	(1,550)
Proceeds from disposal of property and equipment	1	1
Purchases of investments	(37,579)	(47,552)
Redemptions/maturities of short-term investments	26,056	54,181
Net cash (used in) provided by investing activities	(13,619)	5,080
Financing Activities:
Proceeds from issuance of common stock	1,375	649
Payments for repurchase of common stock	0	(4,095)
Payment of withholding tax on stock-based compensation	(1,190)	(365)
Principle payments on capital leases	(64)	(34)
Cash dividends	(2,730)	(2,589)
Net cash used in financing activities	(2,609)	(6,434)
Cash flows from discontinued operations:
Net cash used in operating activities	(697)	(321)
Net cash provided by (used in) investing activities	1,434	(149)
Net (decrease) increase in cash and cash equivalents	(8,415)	6,053
Effect of exchange rate changes on cash	87	(3)
Cash and cash equivalents, beginning of year	14,855	7,055
Cash and Cash Equivalents, End of Period	$ 6,527	$ 13,105