Commitments and Contingencies - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Minimum monthly rental expense		$ 4,000
Discount rate (as a percent)	12.00%	12.00%
Right-of-use asset	$ 204,000	$ 204,000	$ 0
Operating lease liability	200,000	200,000
Operating lease cost	100,000	$ 200,000
Remaining lease term		1 year
Remaining lease payments for remainder of fiscal year	$ 200,000	$ 200,000
Building
Lessee, Lease, Description [Line Items]
Minimum monthly rental expense		$ 24,100
Annual rent increase (as a percent)	3.00%	3.00%