LEASES - Future minimum lease payments under finance leases and operating leases - (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Finance leases
2020	$ 409
2021	527
2022	202
2023	34
Total lease payments	1,172
Less - portion representing interest	(116)
Present value of lease obligations	1,056
Less - Current portion of lease obligations	(462)	$ (546)
Long-term portion of lease obligations	594	673
Operating Leases
2020	2,628
2021	3,387
2022	2,902
2023	2,884
2024	2,906
2025 and thereafter	20,119
Total lease payments	34,826
Less - portion representing interest	(12,923)
Present value of lease obligations	21,903		$ 19,508
Less - current portion of lease obligations	(1,579)	(1,326)
Non-current operating lease liabilities	20,324	$ 16,591
Total
2020	3,037
2021	3,914
2022	3,104
2023	2,918
2024	2,906
2025 and thereafter	20,119
Total lease payments	35,998
Less - portion representing interest	(13,039)
Present value of lease obligations	22,959
Less - current portion of lease obligations	(2,041)
Long-term portion of lease obligations	$ 20,918

Amount of lessee's undiscounted obligation for lease payments for operating lease and finance lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease and finance lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease and finance lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease and finance lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease and finance lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease and finance lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease and finance lease, due in next fiscal year following latest fiscal year.

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Present value of lessee's discounted obligation for lease payments from operating and finance lease.

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Present value of lessee's discounted obligation for lease payments from operating lease and finance lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease and finance lease, classified as non-current.

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Amount of operating and finance lease liabilities undiscounted excess amount.

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Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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-Publisher FASB
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-Topic 842
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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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Amount of lessee's undiscounted obligation for lease payments for finance lease.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in remainder of fiscal year following latest fiscal year ended.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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