Quarterly report pursuant to Section 13 or 15(d)

Long - term Debt - Summary of Repurchase of Senior Secured Note (Detail)

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Long - term Debt - Summary of Repurchase of Senior Secured Note (Detail) - Senior Secured Note [Member]
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Principal Repurchased $ 23,100
Cash Paid 21,566
Bond Issue Costs 461
Net Gain $ 1,074
Senior Secured Note Period One [Member]  
Debt Instrument [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 Instrument [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 Instrument [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 Instrument [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 Instrument [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 Instrument [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
Senior Secured Note Period Seven [Member]  
Debt Instrument [Line Items]  
Repurchase date Dec. 21, 2018
Principal Repurchased $ 2,000
Cash Paid $ 1,835
Percent face value 91.75%
Bond Issue Costs $ 38
Net Gain $ 127
Senior Secured Note Period Eight [Member]  
Debt Instrument [Line Items]  
Repurchase date Dec. 21, 2018
Principal Repurchased $ 1,850
Cash Paid $ 1,702
Percent face value 92.00%
Bond Issue Costs $ 35
Net Gain $ 113
Senior Secured Note Period Nine [Member]  
Debt Instrument [Line Items]  
Repurchase date Dec. 21, 2018
Principal Repurchased $ 1,080
Cash Paid $ 999
Percent face value 92.50%
Bond Issue Costs $ 21
Net Gain $ 60
Senior Secured Note Period Ten [Member]  
Debt Instrument [Line Items]  
Repurchase date Nov. 17, 2018
Principal Repurchased $ 1,500
Cash Paid $ 1,357
Percent face value 90.50%
Bond Issue Costs $ 29
Net Gain $ 114
Senior Secured Note Period Eleven [Member]  
Debt Instrument [Line Items]  
Repurchase date May 04, 2018
Principal Repurchased $ 4,000
Cash Paid $ 3,770
Percent face value 94.25%
Bond Issue Costs $ 86
Net Gain $ 144
Senior Secured Note Period Twelve [Member]  
Debt Instrument [Line Items]  
Repurchase date Apr. 10, 2018
Principal Repurchased $ 4,000
Cash Paid $ 3,850
Percent face value 96.25%
Bond Issue Costs $ 87
Net Gain $ 63
Senior Secured Note Period Thirteen [Member]  
Debt Instrument [Line Items]  
Repurchase date Apr. 09, 2018
Principal Repurchased $ 2,000
Cash Paid $ 1,930
Percent face value 96.50%
Bond Issue Costs $ 43
Net Gain $ 27