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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 11,009 $ 10,061 $ 4,966
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 4,871 4,422 4,865
Amortization of marketable securities premium 158 173 94
Impairment charge on equity investee   313  
Stock-based compensation 1,925 1,405 1,096
Provision for doubtful accounts     313
Realized gain on sale of available-for-sale securities   (77) (429)
Loss (gain) on disposal of equipment (99) 57 5
Loss from equity method investments, net 1,080 1,381 1,995
Changes in operating assets and liabilities:      
Accounts receivable 2,819 (7,977) 3,465
Inventories (14,629) (4,740) (2,959)
Prepaid expenses and other current assets (4,600) (2,309) (1,223)
Other assets (1,888) (52) 458
Accounts payable 2,314 4,401 524
Accrued liabilities [1] 518 1,642 205
Other long-term liabilities, including royalties (260) (85) (871)
Net cash provided by operating activities 3,218 8,615 12,504
Cash flows from investing activities:      
Purchases of property, plant and equipment (40,539) (21,356) (2,728)
Proceeds from sale of equipment 99   35
Purchases of available-for-sale securities (9,937) (30,021) (11,936)
Proceeds from sales and maturities of available-for-sale securities 19,550 14,750 13,516
Repayment of related party notes receivable   169  
Net cash used in investing activities (30,827) (36,458) (1,113)
Cash flows from financing activities:      
Proceeds from issuance of common stock and options exercised, net of issuance costs 628 34,338 1,337
Proceeds from sale of subsidiary shares to noncontrolling interests, net of portion allocated to noncontrolling interests   1,765  
Considerations paid in cash to repurchase subsidiary shares from noncontrolling interests (415)    
Dividends paid by joint ventures to their minority shareholders   (465) (39)
Net cash provided by financing activities 213 35,638 1,298
Effect of exchange rate changes on cash and cash equivalents (430) 405 (1,412)
Net (decrease) increase in cash and cash equivalents (27,826) 8,200 11,277
Cash and cash equivalents at the beginning of the year 44,352 36,152 24,875
Cash and cash equivalents at the end of the year 16,526 44,352 36,152
Supplemental disclosures:      
Income taxes paid, net of refunds 1,134 $ 714 $ 788
Supplemental disclosure of non-cash flow information:      
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities 1,192    
Reduction of noncontrolling interests in excess of total consideration paid and payable in connection with the repurchase of subsidiaries shares from noncontrolling interests 187    
Consideration payable in connection with constructions, included in accrued liabilities $ 2,912    
[1] * Dividend accrued but not paid by joint ventures of $504, $533 and $499 was included in accrued liabilities as of December 31, 2018, 2017 and 2016, respectively.