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Summary of Significant Accounting Policies - Recently Issued and Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of adoption of ASU 2016-09 $ 0  
Accounting Standards Update 2016-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Deferred tax assets related to stock-based compensation costs   $ 17,900
Additional Paid-in Capital    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of adoption of ASU 2016-09 $ 1,461