Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 27, 2015	Jun. 30, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001
Subsequent Event
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)	$ 0.001
Proceeds from issuance of common stock	$ 15.7
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Underwritten public offering (shares)	2,974,136
Price per share (usd per share)	$ 5.80