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INCOME TAXES - Tax Loss and Tax Credit Carryforwards (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total credit carry forwards, Tax Benefit $ 21,562
Research Tax Credit [Member] | Federal [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total credit carry forwards, Tax Benefit $ 12,928
Research Tax Credit [Member] | Federal [Member] | Minimum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2029
Research Tax Credit [Member] | Federal [Member] | Maximum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2037
Foreign [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total credit carry forwards, Tax Benefit $ 6,161
Tax credit carryforwards, Expiration Date Dec. 31, 2027
State [Member] | Research Tax Credit [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Total credit carry forwards, Tax Benefit $ 2,473
State [Member] | Research Tax Credit [Member] | Minimum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2025
State [Member] | Research Tax Credit [Member] | Maximum [Member]  
Tax Credit And Operating Loss Carryforwards [Line Items]  
Tax credit carryforwards, Expiration Date Dec. 31, 2030