Commitments (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Nov. 30, 2010	Mar. 31, 2017	Mar. 31, 2016
Operating Leases
Initial term of the operating lease for office and laboratory space	5 years
Extension term upon the completion of the initial lease term	5 years
Rent expense		$ 300	$ 200
Future minimum payments required under the non-cancelable operating lease
Remainder 2017		1,019
2018		680
Total minimum lease payments		$ 1,699