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Income Tax Provision - Reconciliation of Gross Unrecognized Tax Benefits (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance, January 1 $ 0 $ 0 $ 700,000
Tax positions related to prior years:      
Reductions 0 0 (700,000)
Ending balance, December 31 $ 0 $ 0 $ 0