Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Commitments and Contingencies [Line Items]
Security deposit of lease agreement	$ 39		$ 39		$ 54
Reduction in security deposits			18
Rent expense	$ 35	$ 35	$ 105	$ 105
Austin, TX
Commitments and Contingencies [Line Items]
Operating lease agreement, commencement date			2015-01
Operating lease agreement, amended date			2016-09
Operating lease agreement, expiration date			Dec. 31, 2020