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Commitment and Contingencies (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Feb. 27, 2017
Dec. 31, 2016
Oct. 09, 2015
Loss Contingencies [Line Items]              
Operating lease obligations $ 9,600,000   $ 9,600,000   $ 3,100,000    
Rent expense 500,000 $ 500,000 1,500,000 $ 1,500,000      
Per incident policy limit     $ 100,000        
Quota share of tenant liability insurance provided, percent     100.00%        
Other current liabilities              
Loss Contingencies [Line Items]              
Liability for reported claims and claims incurred but not reported 400,000   $ 400,000     $ 300,000  
Prepaid expenses and other current assets              
Loss Contingencies [Line Items]              
Deposits held with a third party related to insurance services collateral 1,500,000   1,500,000     1,200,000  
Credit Facility | Revolving Facility              
Loss Contingencies [Line Items]              
Maximum borrowing capacity             $ 25,000,000.0
Credit Facility | Term Loan              
Loss Contingencies [Line Items]              
Line of credit, amount outstanding $ 0   $ 0     $ 0