DEBT AND OTHER FINANCING ARRANGEMENTS - JP Morgan Chase Bank Credit Agreement (Details)		3 Months Ended			6 Months Ended
	Aug. 14, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Total interest expense		$ 596,000		$ 833,000	$ 3,881,000	$ 1,298,000
2020 Antara Term Facility | Term Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30,000,000.0
Total interest expense		0	$ 2,800,000	379,000	2,779,000	379,000
Recognition of unamortized issuance costs and debt discount			$ 2,600,000
2021 JPMorgan Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 5,000,000
Total interest expense		$ 303,000		$ 0	$ 475,000	$ 0
Term	3 years
Commitment fee	0.50%
Interest rate, increase	2.00%
Adjusted quick ratio, maximum	3.00
2021 JPMorgan Credit Facility | Line of Credit | December 31, 2020 through September 30, 2022
Debt Instrument [Line Items]
Periodic payment, principal	$ 187,500
Annual principal payment	750,000
Line Of Credit Facility, Total Repayment	1,500,000
2021 JPMorgan Credit Facility | Line of Credit | December 31, 2022 through June 30, 2023
Debt Instrument [Line Items]
Periodic payment, principal	375,000
Line Of Credit Facility, Total Repayment	$ 1,125,000
2021 JPMorgan Credit Facility | Line of Credit | Period One
Debt Instrument [Line Items]
Adjusted quick ratio, minimum	2.00
2021 JPMorgan Credit Facility | Line of Credit | Period Two
Debt Instrument [Line Items]
Adjusted quick ratio, minimum	2.50
2021 JPMorgan Credit Facility | Line of Credit | Period Three
Debt Instrument [Line Items]
Adjusted quick ratio, minimum	2.75
2021 JPMorgan Credit Facility | Line of Credit | Period Four
Debt Instrument [Line Items]
Adjusted quick ratio, minimum	3.00
2021 JPMorgan Credit Facility | Line of Credit | LIBOR
Debt Instrument [Line Items]
Variable rate	3.75%
2021 JPMorgan Revolving Facility | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 5,000,000
2021 JPMorgan Secured Term Facility | Term Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 15,000,000
Minimum | 2021 JPMorgan Credit Facility | Line of Credit | LIBOR
Debt Instrument [Line Items]
Variable rate	2.75%
Minimum | 2021 JPMorgan Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Variable rate	3.75%
Maximum | 2021 JPMorgan Credit Facility | Line of Credit | LIBOR
Debt Instrument [Line Items]
Variable rate	3.75%
Maximum | 2021 JPMorgan Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Variable rate	4.75%