Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Schedule of Debt Restructuring as per Restructuring Agreement for Subsequent Periods (Parenthetical) (Detail)

v3.21.2
Subsequent Events - Schedule of Debt Restructuring as per Restructuring Agreement for Subsequent Periods (Parenthetical) (Detail)
$ in Millions
Jul. 13, 2020
USD ($)
8% Senior Unsecured Debentures [Member]  
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]  
Debt instrument interest rate stated percentage 8.00%
After Consummation of Recapitalization Transaction [member] | 8% Senior Unsecured Debentures [Member]  
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]  
Debt instrument maturity date five years
Interim Financing [Member] | ICM [member]  
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]  
Proceeds from short term loans $ 14.7
Restructured Senior Debt [member] | Payment in Kind (PIK) Note [member]  
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]  
Debt instrument interest rate stated percentage 8.00%
Restructured Senior Debt [member] | Secured Convertible Notes [member]  
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]  
Decrease in pricipal balance of debt instrument $ 85.0
Restructured Senior Debt [member] | After Consummation of Recapitalization Transaction [member]  
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]  
Debt instrument maturity date five years