Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Lease, Assets, Noncurrent [Abstract]
Operating lease right-of-use assets	$ 1,049
Office and other equipment, net of accumulated depreciation and amortization	752
Total lease assets	1,801
Lease, Liabilities, Current [Abstract]
Operating lease liabilities	658
Finance lease liabilities	354
Lease, Liabilities, Noncurrent [Abstract]
Operating lease liabilities	442
Finance lease liabilities	193
Total lease liabilities	$ 1,647
Adjustments for ASC 842 implementation		$ 166
Noncontrolling Interest
Lease, Liabilities, Noncurrent [Abstract]
Adjustments for ASC 842 implementation		99
Accumulated Deficit
Lease, Liabilities, Noncurrent [Abstract]
Adjustments for ASC 842 implementation		67
Accounting Standards Update 2016-02 | Noncontrolling Interest
Lease, Liabilities, Noncurrent [Abstract]
Adjustments for ASC 842 implementation		100
Accounting Standards Update 2016-02 | Accumulated Deficit
Lease, Liabilities, Noncurrent [Abstract]
Adjustments for ASC 842 implementation		$ (70)