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Commitments and Contingencies - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
facility
Jun. 30, 2018
USD ($)
Jan. 01, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]          
Number of leased facilities | facility     2    
Rent expense $ 49 $ 73 $ 101 $ 148  
Initial ROU assets, recognized as non-cash addition         $ 99
Present value of operating lease liability     $ 44