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Income Taxes - Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation between the amount of reported income tax and the amount computed using U.S. Statutory rate      
Pre-tax loss $ (117,313) $ (128,530) $ (127,197)
Loss at Statutory Rates (39,887) (43,700) (43,247)
Difference in Foreign Tax Rates 326 150  
Research and Development Credits (2,847) (5,203) (4,935)
State Taxes (6,283) (7,268) (10,642)
Income Tax Rate Change 99,528    
Other (321) 2,111 1,584
Recognition of APIC NOLs (5,729)    
Impact of Pass-through Entities (2,775)    
Expiration of Net Operating Losses and Research & Development Tax Credits     155
Change in Valuation Allowance (66,294) $ 53,910 $ 57,085
Income Tax (Benefit) Provision $ (24,282)