Commitments and Contingencies - Operating Lease Assets And Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Right-of-use assets	$ 2,393	$ 1,566	$ 0
Operating Lease Obligations	2,546
Remaining Cash Commitment	$ 3,286