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Related Party Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2017
Nov. 30, 2016
Feb. 28, 2014
Mar. 31, 2013
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]            
Repayment of stockholders’ notes receivable         $ 0 $ 84
Interest expense         $ 5,108 6,204
Chief Financial Officer            
Related Party Transaction [Line Items]            
Stockholders’ notes receivable       $ 200    
Stockholders' note interest rate (percent)       1.09%    
Repayment of stockholders’ notes receivable   $ 100        
Chief Executive Officer            
Related Party Transaction [Line Items]            
Stockholders’ notes receivable     $ 400      
Stockholders' note interest rate (percent)     1.97%      
Chief Executive Officer | Forgiveness of Related Party Promissory Note            
Related Party Transaction [Line Items]            
Notes receivable forgiven $ 200          
Notes receivable percentage of principal approved for forgiveness 50.00%          
Stock-based compensation expense           400
Interest expense           $ 100