Commitments and Contingencies - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) facility	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of leased facilities | facility			2
Rent expense	$ 52		$ 153
Rent expense		$ 75		$ 223
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Present value of operating lease liability			$ 66
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Initial ROU assets, recognized as non-cash addition					$ 99