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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (3,913) $ 4,820 $ 6,981
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation 644 702 628
Lease amortization 1,946    
Net loss (gain) on disposal of assets 5 (21)  
Gain on cumulative translation adjustment recognition from liquidation of subsidiaries     (1,703)
Gain on liquidation of a subsidiary   (909)  
Reversal of FIN 45 & FIN 48 due to expiration of statute of limitations (1,182) (2,462) (1,409)
Equity loss of associates   613 687
Investment impairment   370 1,690
Gain on reversal of accounts payable (3,161)    
Stock-based compensation expense 1,399 1,097 866
Provision for doubtful accounts receivable 4,396 812 4
Deferred income taxes (465) 705 (1,092)
Changes in operating assets and liabilities      
Accounts receivable (21,561) (44,815) 1,413
Inventories and deferred costs 20,182 6,565 1,212
Prepaid and other assets (3,625) 5,540 (7,280)
Accounts payable (19,882) 23,193 5,183
Income taxes payable 506 (929) (26)
Customer advances (401) (6,044) (7,218)
Deferred revenue (2,259) (4,930) (3,172)
Other liabilities 3,224 (10,413) 7,074
Net cash provided by (used in) operating activities (24,147) (26,106) 3,838
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (507) (225) (732)
Acquisition of uSTAR, net of cash acquired   (673)  
Purchase of short-term investments (41)   (3,164)
Purchase of investments     (481)
Proceeds from sale of investments     500
Proceeds from sale of short-term investments 41 3,143  
Net cash provided by (used in) investing activities [1] (507) 2,245 (3,877)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from exercise of stock options 56 101 113
Proceeds from short-term borrowing 4,625    
Repayment of short-term borrowing (4,625)    
Repurchase of ordinary shares (1,049) (2,525) (140)
Net cash used in financing activities (993) (2,424) (27)
Effect of exchange rate changes on cash and cash equivalents 554 (701) 2,112
Net increase (decrease) in cash and cash equivalents [1] (25,093) (26,986) 2,046
Cash, cash equivalents and restricted cash at beginning of year [1] 73,700 100,686 98,640
Cash, cash equivalents and restricted cash at end of year [1] 48,607 73,700 100,686
Cash paid:      
Interest paid 16 47 48
Income taxes paid $ 1,400 $ 1,221 $ 2,012
[1] The Company adopted ASU 2016-18 in 2018 and adjusted the 2017 balances retrospectively.