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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Consolidated net income (loss) $ 258 $ (6,261) $ 5,159
Adjustments to reconcile consolidated net income (loss) to net cash (used for) provided by operating activities:      
Depreciation and amortization 8,893 8,438 9,142
Stock-based compensation expense 1,735 506 1,782
Increase in refundable income taxes (736)    
Increase in contingent consideration obligations 650    
(Decrease) increase in long-term income taxes payable (1) 4 (675)
Deferred income taxes (172) (78) (183)
Decrease in long-term deferred revenue (71) (94) (139)
Increase in other long-term liabilities 93    
(Gain) loss on disposal of equipment (14) 4 (60)
Provision (benefit) for doubtful accounts 6 (22) (18)
Credit gain on available-for-sale securities (11) (13) (12)
Gain from sale of equity method investment     (5,000)
Increase in other assets   (505)  
Gain from disposition of consolidated subsidiary     (28)
Change in current assets and liabilities, net (13,094) (1,435) 1,499
Net cash (used for) provided by operating activities (2,464) 544 11,467
Investing activities:      
Additions to property, plant and equipment (12,545) (8,428) (9,090)
Proceeds from sale of equipment 14 2 60
Increase (decrease) in other assets 5 (93) (204)
Sales and maturities of investments     360
Proceeds from sale of equity method investment     5,000
Deconsolidation of subsidiary     (392)
Net cash used for investing activities (12,526) (8,519) (4,266)
Financing activities:      
Proceeds from issuance of Common Stock 3,300 1,584 820
Payment of contingent consideration obligations (225) (99)  
Deconsolidation of subsidiary   (372)  
Acquisition of noncontrolling interest     (216)
Net cash provided by financing activities 3,075 1,113 604
Effect of foreign exchange rates on cash (25) 52 (12)
Net (decrease) increase in cash and cash equivalents (11,940) (6,810) 7,793
Cash and cash equivalents at beginning of year 56,170 62,980 55,187
Cash and cash equivalents at end of year 44,230 56,170 62,980
Change in current assets and liabilities, excluding effects of disposition of consolidated subsidiary:      
Accounts receivable (9,210) 780 2,201
Inventories, net (9,309) (3,677) 1,880
Other current assets (357) (158) (111)
Accounts payable and accrued liabilities 3,186 339 (1,301)
Accrued severance charges   (195) (1,709)
Income taxes payable 208 61 (10)
Deferred revenue 2,388 1,415 549
Change in current assets and liabilities, net (13,094) (1,435) 1,499
Supplemental disclosures:      
Cash paid during the year for income taxes, net of refunds $ 373 $ 230 $ 675