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Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies The Company leases office space and laboratory facilities in Austin, Texas under operating leases that commenced in January 2015 and February 2017, respectively. The office space lease was amended in September 2016 and extended to December 31, 2020. The laboratory facility lease will expire on December 31, 2017.