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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income $ 2,657 $ 220
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,963 4,173
Amortization of marketable securities premium 28 26
Impairment charge on equity investee   1,068
Stock-based compensation 1,932 1,709
Provision for doubtful accounts 87  
Loss on disposal of equipment 36 43
Gain from deconsolidation of a subsidiary   (175)
Loss from equity method investments, net 243 757
Return on equity method investments   362
Changes in operating assets and liabilities:    
Accounts receivable (3,500) 1,876
Inventories 1,638 8,272
Prepaid expenses and other current assets (1,790) 3,277
Other assets (424) (3,108)
Accounts payable 1,992 (4,993)
Accrued liabilities (1,226) (6,216)
Other long-term liabilities, including royalties 1,688 46
Net cash provided by operating activities 6,324 7,337
Cash flows from investing activities:    
Purchases of property, plant and equipment (12,121) (13,969)
Purchases of available-for-sale debt securities (2,880) (8,725)
Proceeds from sales and maturities of available-for-sale debt securities 4,901 20,988
Net cash used in investing activities (10,100) (1,706)
Cash flows from financing activities:    
Proceeds from common stock options exercised 1,137 267
Proceeds from sale of previously consolidated subsidiary shares   366
Consideration paid to repurchase subsidiary shares from noncontrolling interests   (262)
Payments on short-term loan (5,801)  
Proceeds from short-term loan 3,380 5,760
Proceeds from sale of subsidiary shares to noncontrolling interest 396  
Dividends paid by joint ventures to their minority shareholders (89)  
Net cash provided by (used in) financing activities (977) 6,131
Effect of exchange rate changes on cash and cash equivalents 245 (451)
Net increase (decrease) in cash and cash equivalents (4,508) 11,311
Cash and cash equivalents at the beginning of the year 26,892 16,526
Cash and cash equivalents at the end of the year $ 22,384 27,837
Supplemental disclosure of non-cash flow information:    
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities   151
Reduction of noncontrolling interests in excess (deficit) of total consideration paid and payable in connection with the repurchase of subsidiary shares from noncontrolling interests   $ (74)