Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Consolidated net income (loss)	$ (6,261)	$ 5,159	$ (14,070)
Adjustments to reconcile consolidated net income (loss) to net cash provided by operating activities:
Depreciation and amortization	8,438	9,142	9,805
Gain from sale of equity method investment		(5,000)
Increase in other assets	(505)
Gain from disposition of consolidated subsidiary		(28)
Stock-based compensation expense	506	1,782	1,634
Increase (decrease) in long-term income taxes payable	4	(675)	(472)
Deferred income taxes	(78)	(183)	18
Decrease in long-term deferred revenue	(94)	(139)	(139)
Loss (gain) on disposal of equipment	4	(60)	(22)
(Benefit) provision for doubtful accounts	(22)	(18)	66
Credit gain on available for sale securities	(13)	(12)	(311)
Change in current assets and liabilities, net	(1,435)	1,499	5,682
Net cash provided by operating activities	544	11,467	2,191
Investing activities:
Additions to property, plant and equipment	(8,428)	(9,090)	(7,128)
Sales and maturities of investments		360	3,460
Purchases of investments			(340)
Proceeds from sale of equity method investment		5,000
Deconsolidation of subsidiary		(392)
Proceeds from sale of equipment	2	60	22
Increase in other assets	(93)	(204)	(43)
Net cash used for investing activities	(8,519)	(4,266)	(4,029)
Financing activities:
Proceeds from issuance of Common Stock	1,584	820	788
Acquisition of noncontrolling interest	(372)	(216)
Payment of contingent consideration obligations	(99)
Noncontrolling interest dividends paid			(162)
Net cash provided by financing activities	1,113	604	626
Effect of foreign exchange rates on cash	52	(12)	60
Net (decrease) increase in cash and cash equivalents	(6,810)	7,793	(1,152)
Cash and cash equivalents at beginning of period	62,980	55,187	56,339
Cash and cash equivalents at end of period	56,170	62,980	55,187
Change in assets and liabilities, excluding effects of disposition of consolidated subsidiary:
Accounts receivable	780	2,201	(1,151)
Inventories, net	(3,677)	1,880	3,202
Other current assets	(158)	(111)	1,029
Accounts payable and accrued liabilities	339	(1,301)	300
Accrued severance charges	(195)	(1,709)	1,855
Income taxes payable	61	(10)	26
Deferred revenue	1,415	549	421
Change in current assets and liabilities, net	(1,435)	1,499	5,682
Supplemental disclosures:
Cash paid during the year for income taxes, net of refunds	$ 230	$ 675	$ (1,529)