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Commitments and Contingencies - Line of Credit (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Nov. 30, 2016
Sep. 30, 2013
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 15,000,000 $ 10,000,000
Line of credit facility, interest rate during period 5.00%    
Origination fee   100,000  
Deposit account balance requirement   6,000,000  
Requirements for EBITDA   24,000,000  
Remaining borrowing capacity $ 13,200,000    
After certain conditions are met      
Debt Instrument [Line Items]      
Deposit account balance requirement   $ 3,000,000  
Prime Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%