Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Operating Lease, Weighted Average Discount Rate, Percent	9.90%	9.90%
Operating Lease, Cost	$ 50,000	$ 101,000
Operating Lease, Payments	$ 75,000	149,000
Non Cash Operating Lease Assets Acquired		$ 538,000	$ 0
Operating Lease Expiration Year		2022
Accounting Standards Update 2016-02 [Member]
Non Cash Operating Lease Assets Acquired		$ 538,000