Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Lease, Assets, Noncurrent [Abstract]
Operating lease right-of-use assets	$ 870
Office and other equipment, net of accumulated depreciation and amortization	703
Total lease assets	1,573
Lease, Liabilities, Current [Abstract]
Operating lease liabilities	507
Finance lease liabilities	318
Lease, Liabilities, Noncurrent [Abstract]
Operating lease liabilities	394
Finance lease liabilities	160
Total lease liabilities	$ 1,379
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