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Stock-Based Compensation - Employee Restricted Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 26, 2018
Jan. 02, 2018
Aug. 03, 2017
Sep. 28, 2016
Mar. 31, 2018
Mar. 31, 2017
Stock-Based Compensation            
Total Stock-based compensation expense (in dollars)         $ 1,945 $ 3,821
Restricted stock | Employees            
Stock-Based Compensation            
Total Stock-based compensation expense (in dollars)         728  
Unrecognized compensation expense (in dollars)         11,111  
Restricted stock | Employees | Award Date of September 28, 2016            
Stock-Based Compensation            
Awards, other than options, granted (in shares)       700,386    
Share price (in dollars per share)       $ 12.00    
Total Stock-based compensation expense (in dollars)         0 $ 3,075
Unrecognized compensation expense (in dollars)         $ 0  
Restricted stock | Employees | Award Date August 3, 2017            
Stock-Based Compensation            
Awards, other than options, granted (in shares)     20,000      
Share price (in dollars per share)     $ 14.56      
Annual vesting (as a percent)     25.00%      
Vesting period     4 years      
Restricted stock | Employees | Award Date January 2, 2018            
Stock-Based Compensation            
Awards, other than options, granted (in shares)   390,500        
Share price (in dollars per share)   $ 29.25        
Annual vesting (as a percent)   25.00%        
Vesting period   4 years        
Restricted stock | Employees | Award Date February 25, 2018            
Stock-Based Compensation            
Awards, other than options, granted (in shares) 4,754          
Share price (in dollars per share) $ 32.64          
Vesting period 1 year