XML 67 R55.htm IDEA: XBRL DOCUMENT v3.19.1
LEASES- Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease description The Company used the incremental borrowing rate on January 1, 2019 for operating leases that commenced prior to that date. Current lease agreements do not contain any residual value guarantees or material restrictive covenants. As of March 31, 2019, the Company did not have any finance leases and no additional operating leases that had not yet commenced.  
Lessee Lease Description [Line Items]    
Operating lease, right-of-use asset $ 8,000  
Operating lease liabilities current 1,300  
Long-term operating lease liabilities 6,700  
Operating lease cost $ 430 $ 1,700
Minimum [Member]    
Lessee Lease Description [Line Items]    
Operating leases remaining term 1 year  
Maximum [Member]    
Lessee Lease Description [Line Items]    
Operating leases remaining term 9 years