Commitments and Contingencies - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease - right of use asset, net	$ 2,602	$ 3,117
Operating lease liabilities, current	1,294	1,294
Operating lease liabilities, non-current	1,487	$ 2,020
Total operating lease liabilities	$ 2,781