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Borrowings - Line of Credit (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Nov. 30, 2016
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 15,000,000
Deposit account balance requirement     6,000,000
Requirements for EBITDA     24,000,000
Letters of credit $ 5,000,000 $ 9,005,000  
Remaining borrowing capacity 4,300,000    
Secured      
Debt Instrument [Line Items]      
Letters of credit $ 10,733,000    
After Certain Conditions are Met      
Debt Instrument [Line Items]      
Deposit account balance requirement     $ 3,000,000