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INCOME TAXES - Tax Loss and Tax Credit Carryforwards (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total loss carry forwards, Related Tax Deduction $ 27,473
Total loss carry forwards, Tax Benefit 3,434
Total credit carry forwards, Tax Benefit 28,833
Foreign [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total loss carry forwards, Related Tax Deduction 27,473
Total loss carry forwards, Tax Benefit 3,434
Total credit carry forwards, Tax Benefit $ 13,754
Foreign [Member] | Minimum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2023
Foreign [Member] | Maximum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2026
State [Member] | Research Tax Credit [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total credit carry forwards, Tax Benefit $ 2,383
State [Member] | Research Tax Credit [Member] | Minimum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2023
State [Member] | Research Tax Credit [Member] | Maximum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2030
Federal [Member] | Research Tax Credit [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total credit carry forwards, Tax Benefit $ 12,696
Federal [Member] | Research Tax Credit [Member] | Minimum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2027
Federal [Member] | Research Tax Credit [Member] | Maximum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2036