Commitments (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Dec. 31, 2011	Nov. 30, 2010	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Leases
Initial term of the operating lease		5 years
Extension term upon the completion of the initial lease term	5 years
Rent expense			$ 200	$ 200	$ 600	$ 500
Future minimum annual lease commitments under the noncancelable operating lease
Remainder 2015			235		235
2016			937		937
2017			467		467
Total			$ 1,639		$ 1,639