Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Long - term Debt - Summary of Repurchase of Senior Secured Note (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Principal Repurchased $ 18,700 $ 16,400
Cash Paid 16,800 15,400
Net Gain 1,700 $ 600
Senior Secured Note [Member]    
Debt Instrument [Line Items]    
Principal Repurchased 35,164  
Cash Paid 32,194  
Bond Issue Costs 652  
Net Gain $ 2,318  
Senior Secured Note [Member] | Senior Secured Note Period One [Member]    
Debt Instrument [Line Items]    
Repurchase date Dec. 27, 2019  
Principal Repurchased $ 3,090  
Cash Paid $ 2,874  
Percent face value 93.00%  
Bond Issue Costs $ 48  
Net Gain $ 167  
Senior Secured Note [Member] | Senior Secured Note Period Two [Member]    
Debt Instrument [Line Items]    
Repurchase date Nov. 27, 2019  
Principal Repurchased $ 5,183  
Cash Paid $ 4,548  
Percent face value 87.75%  
Bond Issue Costs $ 82  
Net Gain $ 553  
Senior Secured Note [Member] | Senior Secured Note Period Three [Member]    
Debt Instrument [Line Items]    
Repurchase date Nov. 15, 2019  
Principal Repurchased $ 3,791  
Cash Paid $ 3,206  
Percent face value 84.58%  
Bond Issue Costs $ 61  
Net Gain $ 524  
Senior Secured Note [Member] | Senior Secured Note Period Four [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 [Member] | Senior Secured Note Period Five [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 [Member] | Senior Secured Note Period Six [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 [Member] | Senior Secured Note Period Seven [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 [Member] | Senior Secured Note Period Eight [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 [Member] | Senior Secured Note Period Nine [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 [Member] | Senior Secured Note Period Ten [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 [Member] | Senior Secured Note Period Eleven [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 [Member] | Senior Secured Note Period Twelve [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 [Member] | Senior Secured Note Period Thirteen [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 [Member] | Senior Secured Note Period Fourteen [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 [Member] | Senior Secured Note Period Fifteen [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 [Member] | Senior Secured Note Period Sixteen [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