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Summary of Significant Accounting Policies - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
Jan. 01, 2018
Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Deferred income tax assets, net $ 0  
Accounting Standards Update 2016-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Deferred income tax assets, net   $ 4,000
Credit to retained earnings (4,454) 4,000
Accounting Standards Update 2016-09 | Retained Earnings    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Credit to retained earnings $ (4,454) $ 4,000