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Debt - 2016 Loan and Security Agreement (Details) - USD ($)
Aug. 01, 2016
Jun. 30, 2018
Line of Credit Facility [Line Items]    
Unrestricted cash required to be deposited with lenders   $ 25,000,000
Line of Credit | Loan and Security Agreement 2016 | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Credit facility, maximum borrowing capacity $ 50,000,000  
Unused line of credit capacity fee 0.25%  
First and second anniversary fee for line of credit $ 31,250  
Prime Rate | Line of Credit | Loan and Security Agreement 2016 | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Debt instrument, basis spread 0.50%  
Percentage increase in interest rate if adjusted EBITDA is negative at the end of the quarter 0.25%