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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 6,981 $ 132 $ (27,158)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation 628 1,208 2,202
Net loss (gain) on disposal of assets   (62) 180
Gain on cumulative translation adjustment recognition from liquidation of subsidiaries (1,703) (38)  
Gain on release of tax liability due to expiration of statute of limitations (1,409) (3,272) (7,747)
Equity loss (gain) of associates 687 (984) 13,954
Investment impairment 1,690 5,336 16,347
Gain on sale of short- term investment   (83) (1,529)
Stock-based compensation expense 866 2,238 1,546
Provision for doubtful accounts receivable 4 1,564 79
Loan recovery, net     (538)
Deferred income taxes (1,092) 771 1,030
Changes in operating assets and liabilities      
Accounts receivable 1,413 (1,966) (1,491)
Inventories and deferred costs 1,212 (190) 35,973
Prepaids and other assets (7,280) 2,821 1,558
Accounts payable 5,183 7,393 (12,233)
Income taxes payable (26) (751) 3,369
Customer advances (7,218) (1,054) (17,352)
Deferred revenue (3,172) (10,556) (18,610)
Other liabilities 7,074 3,225 (1,216)
Net cash provided by (used in) operating activities 3,838 5,732 (11,636)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Additions to property, plant and equipment (732) (1,527) (917)
Net proceeds from sales of property, plant and equipment   85  
Change in restricted cash (6,219) 1,322 707
Purchase of short-term investments (3,164)    
Purchase of investments (481) (300) (1,670)
Proceeds from sale of investments 500 7,683 16,228
Proceeds from sale of short-term investments     3,076
Net cash provided by (used in) investing activities (10,096) 7,263 17,424
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from exercise of stock options 113   39
Acquisition of non-controlling interests   (304)  
Repurchase of ordinary shares (140) (4,096) (3,695)
Net cash used in financing activities (27) (4,400) (3,656)
Effect of exchange rate changes on cash and cash equivalents 2,112 (1,723) (2,906)
Net increase (decrease) in cash and cash equivalents (4,173) 6,872 (774)
Cash and cash equivalents at beginning of year 83,922 77,050  
Cash and cash equivalents at end of year 79,749 83,922 77,050
Cash paid (Recovered):      
Interest 47 55 76
Income taxes $ 2,012 $ 3,311 $ (363)