Commitments and Contingencies (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2015 ft²	Nov. 30, 2015 ft² item	Oct. 31, 2014 ft²	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) ft²
Leases
Operating lease agreement term		1 year	5 years
Rental square feet office space | ft²		1,000	4,000
Number of operating lease annual renewal options | item		2
Term of annual renewal options		1 year
Rent expense under operating lease				$ 300	$ 300	$ 100
Annual future minimum lease payments
2018				340
2019				324
2020				330
2021				139
Total minimum lease payments				$ 1,133
Employee Benefit Plan
Maximum employees contribution (as a percent)				50.00%
Vesting period				4 years
Amended Lease
Leases
Operating lease agreement term	62 months
Rental square feet office space | ft²	8,500					8,500
License Agreement | Purdue Neuroscience Company
License agreement
Expiration period of obligation to pay royalties				10 years