LEASES - Reported under ASC 842 and ASC 840 (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 02, 2019	Jan. 01, 2019
Future minimum lease payments for non-cancellable operating leases
2020		$ 1,022
2021		876
2022		574
2023		585
2024		345
Total operating lease payment		3,402
Less: discount to present value		232
Total operating lease liabilities		3,170
Less: current operating lease liabilities	$ 1,337	923	$ 1,337				$ 913	$ 2,103
Noncurrent operating lease liabilities	$ 2,438	$ 2,247	$ 2,438				$ 2,482	$ 3,444
Prior to the adoption of ASC 842, future obligations for non-cancellable operating leases
2019					$ 3,792
2020					2,350
2021					1,899
2022					968
2023					999
Thereafter					599
Total operating lease payments					$ 10,607
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Predecessor	Predecessor	Predecessor	Predecessor