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G. FAIR VALUE OF FINANCIAL INSTRUMENTS - SUMMARY (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets:    
Cash and cash equivalents $ 50,224 $ 28,074
Restricted cash 1,740 4,719
Short term investments 44 7,886
Total assets 52,008 40,679
Liabilities:    
Bank acceptance payable 307 2,998
Total liabilities 307 2,998
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash and cash equivalents 50,224 28,074
Restricted cash 1,740 4,719
Short term investments 44 7,886
Total assets 52,008 40,679
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Liabilities:    
Bank acceptance payable 307 2,998
Total liabilities $ 307 $ 2,998