DEBT - ABL Loan Agreement (Details) - USD ($)		3 Months Ended			9 Months Ended
	Oct. 25, 2019	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Line of Credit Facility [Line Items]
Loss on early extinguishment of debt			$ 94,000	$ 36,000	$ 508,000	$ 36,000
Third Amendment, Amended And Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			65,000,000.0		$ 65,000,000.0
Payment of fees, expenses, and accrued interest			$ 100,000
Third Amendment, Amended And Restated Credit Agreement [Member] | Subsequent Event [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Payment for debt extinguishment	$ 75,400,000
Loss on early extinguishment of debt		$ 1,400,000
Secured Debt [Member] | Asset-Based Credit Facility [Member] | Subsequent Event [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	120,000,000.0
Payment of fees, expenses, and accrued interest	1,300,000
Borrowing availability	$ 21,400,000
Debt term	5 years
Percentage of secured eligible accounts receivable	85.00%
Amount of supplemental availability	$ 16,900,000
Borrowing base	119,300,000
Additional capacity	30,000,000.0
Letters of Credit [Member] | Subsequent Event [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Backstop for outstanding letters of credit	21,200,000
Swing Loan [Member] | Asset-Based Credit Facility [Member] | Subsequent Event [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	15,000,000.0
Standby Letters of Credit [Member] | Asset-Based Credit Facility [Member] | Subsequent Event [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 35,000,000.0