The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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The increase (decrease) during the reporting period in the book value of deferred leasing fees. Amortization of these fees over the terms of the leases reduces deferred leasing fees. Originating new leases increases the balance of deferred leasing fees.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Lease and Lease Guarantee
Amortization of lease guarantee	$ 325	$ 325	$ 190
Future minimum lease payments
2019	403
2020	416
2021	428
2022	441
2023	201
Thereafter	0
Total lease payments	1,889
Lease payments guarantee
Operating Lease and Lease Guarantee
Amortization of lease guarantee	300	$ 300	$ 200
Future minimum lease payments
Total lease payments	9,300
Lease payments guarantee \| Other long-term liabilities
Operating Lease and Lease Guarantee
Carrying value of lease guarantee	$ 500