LONG-TERM DEBT - Credit Facility Narrative (Details)				9 Months Ended
	Nov. 09, 2021 USD ($) director $ / shares shares	Oct. 29, 2021 USD ($)	Dec. 18, 2020 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Cash and cash equivalents				$ 16,972,000	$ 24,586,000
Restricted cash				4,000,000
Warrant exercise price (in dollars per share) | $ / shares			$ 7.75
Subsequent Event
Debt Instrument [Line Items]
Number of securities called by warrants (in shares) | shares	4,082,949
Warrant exercise price (in dollars per share) | $ / shares	$ 1.50
Number of members on Board of Directors | director	7
ABL Facility
Debt Instrument [Line Items]
Available borrowing capacity				$ 27,000,000
Fixed charge coverage ratio, minimum				1.00
ABL Facility | Debt Tranche One
Debt Instrument [Line Items]
Maximum percent of current borrowing base allowed				0.10
Deposited funds				$ 15,000,000
ABL Facility | Debt Tranche Two
Debt Instrument [Line Items]
Maximum percent of current borrowing base allowed				0.125
Maximum capacity available				$ 18,750,000
Term Loan
Debt Instrument [Line Items]
Accordion feature, increase limit			$ 100,000,000
Principal amount, long-term debt issued			$ 250,000,000
Interest rate, original issue discount			0.03
Proceeds from issuance of debt			$ 242,500,000
Stated interest rate				11.95%
First Amendment | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Interest		$ 5,400,000
Second Amendment | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Interest	$ 7,000,000
Standby Letters of Credit
Debt Instrument [Line Items]
Outstanding letters of credit				$ 24,400,000	$ 19,500,000
Letter of Credit | Line of Credit | ABL Facility
Debt Instrument [Line Items]
Borrowing capacity			150,000,000	$ 24,400,000
Sublimit for issuance			50,000,000
Sublimit for swingline borrowings			35,000,000
Accordion feature, increase limit			$ 50,000,000
Term Loan Credit Agreement, Amendment #3 | Subsequent Event
Debt Instrument [Line Items]
Number of securities called by warrants (in shares) | shares	1,417,051
Warrant exercise price (in dollars per share) | $ / shares	$ 1.50
Subordinated Term Loan Credit Agreement | Subsequent Event
Debt Instrument [Line Items]
Borrowing capacity	$ 50,000,000
Stated interest rate	12.00%
Number of securities called by warrants (in shares) | shares	5,000,000
Warrant exercise price (in dollars per share) | $ / shares	$ 1.50
Proceeds from term loan	$ 22,500,000