LEASES - Reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Operating leases
2020 (excluding the three months ended December 31, 2019)	$ 3,887
2021	4,451
2022	3,787
2023	2,968
2024 and thereafter	7,808
Total minimum lease payments	22,901
Less: amounts representing interest	2,321
Present value of net minimum lease payments	20,580
Less: Current portion of lease obligations	4,571
Non-current portion of lease obligations	16,009
Operating lease assets	20,209
Finance leases
2020 (excluding the three months ended December 31, 2019)	2,029
2021	2,930
2022	3,011
2023	3,094
2024 and thereafter	31,481
Total minimum lease payments	42,545
Less: amounts representing interest	11,144
Present value of net minimum lease payments	31,401
Less: Current portion of lease obligations	1,866
Non-current portion of lease obligations	29,535
ROU assets	$ 28,619
Location of operating lease liabilities included on Consolidated Balance Sheets	us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Location of finance lease liabilities included on Consolidated Balance Sheets	us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:OtherLiabilitiesNoncurrent
Location of operating lease ROU assets included on Consolidated Balance Sheets	us-gaap:OperatingLeaseRightOfUseAsset
Location of finance lease ROU assets included on Consolidated Balance Sheets	us-gaap:PropertyPlantAndEquipmentNet