COMMITMENTS AND CONTINGENT LIABILITIES - Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease liabilities, current (Accrued liabilities)	$ 3,511	$ 3,170
Operating lease liabilities, noncurrent (Other liabilities)	10,972	9,542
Total operating lease liabilities	$ 14,483	$ 12,712
Weighted average remaining lease term	5 years 7 months 6 days	5 years 6 months
Weighted average discount rate	8.30%	8.60%