Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions - Debt Transactions - Schedule of Debt Instruments Senior Secured Note (Detail)

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Recent Transactions - Debt Transactions - Schedule of Debt Instruments Senior Secured Note (Detail) - Debt Transactions [Member]
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Debt [Line Items]  
Principal Repurchased $ 6,670
Cash Paid $ 6,123
Senior Secured Note Period One [Member]  
Debt [Line Items]  
Repurchase date Mar. 28, 2019
Principal Repurchased $ 2,000
Cash Paid $ 1,830
Percent face value 91.50%
Bond Issue Costs $ 37
Net Gain $ 134
Senior Secured Note Period Two [Member]  
Debt [Line Items]  
Repurchase date Mar. 28, 2019
Principal Repurchased $ 2,300
Cash Paid $ 2,125
Percent face value 92.38%
Bond Issue Costs $ 42
Net Gain $ 133
Senior Secured Note Period Three [Member]  
Debt [Line Items]  
Repurchase date Feb. 20, 2019
Principal Repurchased $ 125
Cash Paid $ 114
Percent face value 91.25%
Bond Issue Costs $ 2
Net Gain $ 9
Senior Secured Note Period Four [Member]  
Debt [Line Items]  
Repurchase date Feb. 19, 2019
Principal Repurchased $ 350
Cash Paid $ 319
Percent face value 91.25%
Bond Issue Costs $ 7
Net Gain $ 24
Senior Secured Note Period Five [Member]  
Debt [Line Items]  
Repurchase date Feb. 12, 2019
Principal Repurchased $ 1,325
Cash Paid $ 1,209
Percent face value 91.25%
Bond Issue Costs $ 25
Net Gain $ 91
Senior Secured Note Period Six [Member]  
Debt [Line Items]  
Repurchase date Jan. 10, 2019
Principal Repurchased $ 570
Cash Paid $ 526
Percent face value 92.25%
Bond Issue Costs $ 9
Net Gain $ 35