LEASES - Components of Lease Cost and Other Operating Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 1,936	$ 2,363	$ 4,068	$ 4,868
Short-term lease cost	8	28	19	62
Variable lease cost	$ 471	$ 442	888	972
Operating cash flows used in operating leases			(4,658)	(4,202)
Right-of-use assets obtained in exchange for new operating lease liabilities			$ 1,767	$ 17,090
Weighted-average remaining lease term - operating leases	6 years 18 days	7 years 7 days	6 years 18 days	7 years 7 days
Weighted-average discount rate - operating leases	8.00%	8.00%	8.00%	8.00%

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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