Fair Value Measurements - Carrying Value and Fair Value of Long-Term Debt and Other Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants not settleable in cash, fair value		$ 3,900
5.00% Convertible Senior Notes due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, interest rate	5.00%			5.00%
7.75% Senior Secured Notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, interest rate	7.75%
12.875% Senior Secured Notes due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, interest rate	12.875%
Reported Value Measurement | 5.00% Convertible Senior Notes due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 47,300
Level 2 | Reported Value Measurement | 5.00% Convertible Senior Notes due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	47,301		$ 44,783
Level 2 | Reported Value Measurement | ABL Credit Facility due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0		0
Level 2 | Reported Value Measurement | 7.75% Senior Secured Notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	293,289		292,015
Level 2 | Reported Value Measurement | Term Loan B due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	219,708		230,474
Level 2 | Reported Value Measurement | 12.875% Senior Secured Notes due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	99,213
Level 2 | Estimate of Fair Value Measurement | 5.00% Convertible Senior Notes due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	50,311		66,477
Level 2 | Estimate of Fair Value Measurement | ABL Credit Facility due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0		0
Level 2 | Estimate of Fair Value Measurement | 7.75% Senior Secured Notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	289,521		309,375
Level 2 | Estimate of Fair Value Measurement | Term Loan B due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	215,578		240,625
Level 2 | Estimate of Fair Value Measurement | 12.875% Senior Secured Notes due 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	112,901
Level 3 | Reported Value Measurement | Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants not settleable in cash, fair value			8,206
Level 3 | Reported Value Measurement | Retail Property Term Loan due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,891		43,226
Level 3 | Reported Value Measurement | Mid Pac Term Loan due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	1,399		1,433
Level 3 | Reported Value Measurement | PHL Term Loan due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	5,792
Level 3 | Estimate of Fair Value Measurement | Warrant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants not settleable in cash, fair value			8,206
Level 3 | Estimate of Fair Value Measurement | Retail Property Term Loan due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,891		43,226
Level 3 | Estimate of Fair Value Measurement | Mid Pac Term Loan due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	1,399		$ 1,433
Level 3 | Estimate of Fair Value Measurement | PHL Term Loan due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,792