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Commitments - Additional Information (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments And Contingencies [Line Items]        
Total minimum lease payments   $ 13,370,000    
Standby letter of credit related to operating lease   100,000    
Rent expense   $ 3,300,000 $ 3,300,000  
Condition to participate in 401(k) plan   All full-time employees are eligible to voluntarily participate in the 401(k) Plan after their 90 day introductory period.    
CEO        
Commitments And Contingencies [Line Items]        
Cash bonus due to CEO   $ 750,000   $ 1,600,000
Retention bonus paid to CEO   500,000 $ 600,000  
CEO | Plan Scenario        
Commitments And Contingencies [Line Items]        
CEO's annual base salary   1,750,000    
CEO's performance bonus   $ 750,000    
Subsequent Event        
Commitments And Contingencies [Line Items]        
Additional lease commitments $ 8,900,000      
Increase in total minimum lease payments 8,300,000      
Total minimum lease payments 21,700,000      
Future minimum lease payments cancelled $ 600,000