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Long-Term Debt Obligations - Solar Revolving Credit Facility - Additional Information (Detail) - Solar Revolving Credit Facility [Member]
1 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]    
Senior asset-based revolving credit agreement, total lender commitments $ 50,000,000.0 $ 50,000,000.0
Revolving credit facility, interest rate 2.50% 2.50%
LIBOR Loans [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate description   (i) for LIBOR loans, at our option, three-month LIBOR or daily LIBOR
Base Rate Loans [Member]    
Debt Instrument [Line Items]    
Debt instrument interest rate description   (ii) for Base Rate loans, the highest of (a) the Federal Funds Rate plus 0.50%, (b) the Prime Rate, and (c) the three-month LIBOR plus 1.00%.
Base Rate Loans [Member] | Federal Funds Rate [Member]    
Debt Instrument [Line Items]    
Debt instrument basis spread on variable rate 0.50%  
Base Rate Loans [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Debt instrument basis spread on variable rate 1.00%