SUMMARY OF SIGNIFCANT ACCOUNTING POLICIES - Schedule of Future Minimum Payments Related to Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases
2019	$ 489
2020	652
2021	622
2022	445
2023	0
Thereafter	0
Total future minimum lease payments	2,208
Less: imputed interest	(144)
Total lease liabilities	2,064
Current portion	(586)
Non-current portion	1,478
Finance Leases
2019	19,886
2020	9,800
2021	0
2022	0
2023	0
Thereafter	0
Total future minimum lease payments	29,686
Less: imputed interest	(686)
Total lease liabilities	29,000	[1]
Current portion	(29,000)
Non-current portion	$ 0

[1] The Company entered into a finance lease in the first quarter of 2019. Refer to Note 1 — Summary of Significant Accounting Policies for more information.