Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Lease, Assets, Noncurrent [Abstract]
Operating lease right-of-use assets	$ 3,295
Office and other equipment, net of accumulated depreciation and amortization	630
Total lease assets	3,925
Lease, Liabilities, Current [Abstract]
Operating lease liabilities	586
Finance lease liabilities	256
Lease, Liabilities, Noncurrent [Abstract]
Operating lease liabilities	2,722
Finance lease liabilities	111
Total lease liabilities	$ 3,675
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