Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Commitments and Contingencies [Line Items]
Security deposit of lease agreement	$ 39,000
Rent expense	$ 76,000	$ 35,000
Austin, Texas
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
Austin, Texas | Laboratory Facility
Commitments and Contingencies [Line Items]
Operating lease agreement, commencement date	2017-02
Operating lease agreement, expiration date	2017-12