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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income (loss) $ 10,061 $ 4,966 $ (2,533)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 4,422 4,865 5,494
Amortization of marketable securities premium 173 94 218
Impairment charge on equity investee 313    
Stock-based compensation 1,405 1,096 1,349
Provision for doubtful accounts   313 211
Realized gain on sale of available for sale securities (77) (429) (859)
Loss on disposal of equipment 57 5 17
Loss (gain) from equity method investments, net 1,381 1,995 (462)
Changes in operating assets and liabilities:      
Accounts receivable (7,977) 3,465 (1,076)
Inventories (4,740) (2,959) (45)
Prepaid expenses and other current assets (2,309) (1,223) 1,405
Other assets (52) 458 542
Accounts payable 4,401 524 (485)
Accrued liabilities 1,642 205 (1,085)
Other long-term liabilities, including royalties (85) (871) (813)
Net cash provided by operating activities 8,615 12,504 1,878
Cash flows from investing activities:      
Purchases of property, plant and equipment (21,356) (2,728) (4,150)
Proceeds from sale of equipment   35 2
Purchases of available-for-sale securities (30,021) (11,936) (12,787)
Proceeds from sales and maturities of available-for-sale securities 14,750 13,516 14,309
Investments in non-marketable equity investments     (162)
Dividends received from equity method investments     305
Repayment of related party notes receivable 169    
Net cash used in investing activities (36,458) (1,113) (2,483)
Cash flows from financing activities:      
Proceeds from issuance of common stock and options exercised, net of issuance costs 34,338 1,337 165
Proceeds from sale of subsidiary shares to noncontrolling interests, net of portion allocated to noncontrolling interests 1,765    
Repurchases of the Company's common stock, including commission     (2,287)
Dividends paid by joint ventures to their minority share holders (465) (39) (112)
Net cash provided by (used in) financing activities 35,638 1,298 (2,234)
Effect of exchange rate changes on cash and cash equivalents 405 (1,412) (1,100)
Net increase (decrease) in cash and cash equivalents 8,200 11,277 (3,939)
Cash and cash equivalents at the beginning of the year 36,152 24,875 28,814
Cash and cash equivalents at the end of the year 44,352 36,152 24,875
Supplemental disclosures:      
Income taxes paid, net of refunds $ 714 $ 788 $ 284