XML 83 R68.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Taxes [Abstract]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%    
Income tax expense (benefit) $ (10,753) $ (9,749) $ (16,780) $ (12,130)  
Tax benefit for federal and state R&D credits 8,300        
Unrecognized tax benefits $ 47,900   $ 47,900   $ 26,000