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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities:    
Consolidated net loss $ (954) $ (5,376)
Adjustments to reconcile consolidated net loss to net cash used for operating activities:    
Depreciation and amortization 2,157 2,195
Stock-based compensation expense, net 254 329
Increase in other long-term liabilities 64  
Decrease in long-term deferred revenue (18) (35)
Deferred income taxes   (55)
Provision (benefit) for doubtful accounts 8 (28)
Gain on disposal of equipment (2) (2)
Credit gain on available-for-sale securities (3) (4)
Increase in long-term income taxes payable 2 1
Change in current assets and liabilities, net (2,855) 2,141
Net cash used for operating activities (1,347) (834)
Investing activities:    
Additions to property, plant and equipment (2,648) (1,887)
Proceeds from sale of equipment 2 2
Increase in other assets (65) (214)
Net cash used for investing activities (2,711) (2,099)
Financing activities:    
Proceeds from issuance of Common Stock 760 19
Payment of contingent consideration obligations (45)  
Acquisition of noncontrolling interest   (372)
Net cash provided by (used for) financing activities 715 (353)
Effect of foreign exchange rates on cash   16
Net decrease in cash and cash equivalents (3,343) (3,270)
Cash and cash equivalents at beginning of period 56,170 62,980
Cash and cash equivalents at end of period $ 52,827 $ 59,710