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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Cash flows from operating activities:          
Net income $ 4,147 $ 4,565 $ 11,888 $ 6,788  
Adjustments to reconcile net income to net cash (used in) provided by operating activities:          
Depreciation and amortization     3,445 3,361  
Amortization of marketable securities premium     120 124  
Impairment charge on equity investee       313  
Stock-based compensation     1,392 961  
Realized gain on sale of available-for-sale securities       (77)  
Loss on disposal of equipment     25    
Loss from equity method investments, net     21 1,074  
Changes in operating assets and liabilities:          
Accounts receivable     (917) (6,206)  
Inventories     (14,637) (66)  
Prepaid expenses and other current assets     (3,492) (587)  
Other assets     48 64  
Accounts payable     1,283 2,589  
Accrued liabilities [1]     745 (107)  
Other long-term liabilities, including royalties     (148) (241)  
Net cash (used in) provided by operating activities     (227) 7,990  
Cash flows from investing activities:          
Purchases of property, plant and equipment     (34,289) (16,557)  
Proceeds from sale of equipment     11    
Purchases of available-for-sale securities     (9,936) (26,093)  
Proceeds from sales and maturities of available-for-sale securities     18,590 13,310  
Repayment of related party notes receivable       108  
Net cash used in investing activities     (25,624) (29,232)  
Cash flows from financing activities:          
Proceeds from issuance of common stock and options exercised, net of issuance costs     264 33,384  
Considerations paid in cash to repurchase subsidiary shares from noncontrolling interests     (415)    
Proceeds from short-term loans     291    
Dividends paid by joint ventures to their minority shareholders       (465)  
Net cash provided by financing activities     140 32,919  
Effect of exchange rate changes on cash and cash equivalents     (606) 249  
Net increase (decrease) in cash and cash equivalents     (26,317) 11,926  
Cash and cash equivalents at the beginning of the period     44,352 36,152 $ 36,152
Cash and cash equivalents at the end of the period $ 18,035 $ 48,078 18,035 $ 48,078 $ 44,352
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    
[1] * Dividend accrued but not paid by one of our consolidated subsidiaries of $505 and $521 was included in accrued liabilities as of September 30, 2018 and 2017, respectively.