Commitments and Contingencies - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 02, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Right-of-use assets, net	$ 4,678
Right-of-use lease liabilities, current	923
Right-of-use lease liabilities, noncurrent	4,016		$ 1,854
Total operating lease liabilities	4,939	$ 2,000
Property and equipment, gross	146
Accumulated depreciation	(28)
Property and equipment, net	118
Current liabilities	954		237
Long-term liabilities	103		$ 104
Total finance lease liabilities	$ 134
Weighted average remaining lease term Operating leases	4 years 10 months 25 days
Weighted average remaining lease term Finance leases	4 years 2 months 12 days
Weighted average discount rate Operating leases	9.10%
Weighted average discount rate Finance leases	10.00%