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Subsequent Event - Additional Information (Detail) - Subsequent Event
Aug. 07, 2019
USD ($)
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]  
Subsequent Event [Line Items]  
Credit facility agreement, interest rate 1.75%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]  
Subsequent Event [Line Items]  
Credit facility agreement, interest rate 1.25%
JPMorgan Chase Bank, N.A. [Member]  
Subsequent Event [Line Items]  
Commitment fee, percentage 0.20%
JPMorgan Chase Bank, N.A. [Member] | Prime Rate [Member] | Maximum [Member]  
Subsequent Event [Line Items]  
Credit facility agreement, interest rate 0.50%
JPMorgan Chase Bank, N.A. [Member] | Prime Rate [Member] | Minimum [Member]  
Subsequent Event [Line Items]  
Credit facility agreement, interest rate 0.00%
Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]  
Subsequent Event [Line Items]  
Credit facility agreement, expiration date Jul. 31, 2022
Credit facility agreement, maximum principal amount $ 40,000,000
Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member] | Maximum [Member]  
Subsequent Event [Line Items]  
Credit facility agreement, future increases $ 20,000,000