Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recently Adopted Accounting Policies - ASU 2016-09 (Details)

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Summary of Significant Accounting Policies - Recently Adopted Accounting Policies - ASU 2016-09 (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Decrease in accumulated deficit $ (44,682)   $ (293,896)
Accounting Standards Update 2016-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reserve for uncertain tax position   $ 1,946  
Accumulated Deficit      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Decrease in accumulated deficit $ (10,271)   $ (293,896)
Accumulated Deficit | Accounting Standards Update 2016-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred income tax assets, net   293,896  
Decrease in accumulated deficit   $ 293,896