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Debt - Additional Information (Details) - December Two Thousand Fifteen Facility - Revolving Credit Facility - Secured Debt - USD ($)
 1 Months Ended 6 Months Ended
Dec. 31, 2015
Jul. 31, 2017
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity $ 40,000,000  
Debt instrument, description of variable rate basis   The December 2015 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%.
Line of credit facility, commitment fee percentage 0.20%  
Line of credit facility, amount drawn $ 40,000,000  
Line of credit facility, interest rate 1.82%  
Line of credit facility maturity date   Dec. 31, 2018
London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Line of credit facility, floating interest rate 1.25%  
Minimum    
Debt Instrument [Line Items]    
Minimum deposit held as collateral for line of credit $ 0  
Minimum deposit amount with lender $ 40,000,000  
Minimum | Prime Rate    
Debt Instrument [Line Items]    
Line of credit facility, floating interest rate 0.25%  
Minimum | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Line of credit facility, floating interest rate 1.25%  
Maximum | Prime Rate    
Debt Instrument [Line Items]    
Line of credit facility, floating interest rate 2.75%  
Maximum | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Line of credit facility, floating interest rate 3.75%