Subsequent Event (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Oct. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Subsequent Event [Line Items]
Proceeds from equity offering program		$ 0	$ 12,508
Subsequent Event | At the market equity offering | Cowen and Company, LLC
Subsequent Event [Line Items]
Common stock, shares issued (in shares)	1,062,330
Proceeds from equity offering program	$ 21,200
Proceeds from underwritten public offering after fees and commissions	20,400
Common stock remained available for sale	$ 5,800