Description of Business (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended
	Apr. 05, 2016 USD ($) item	Mar. 18, 2016 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Mar. 31, 2016 segment $ / shares
Number of operating segments | segment				1
Common Stock
Number of shares issued in private placement | shares		4,404,658
Common stock issue price, in an underwritten public offering (in dollars per share) | $ / shares		$ 35.19
Proceeds from issuance of private placement		$ 155.0
Accredited investors | Common Stock
Number of shares issued in private placement | shares			4,404,658
Common stock issue price, in an underwritten public offering (in dollars per share) | $ / shares			$ 35.19	$ 35.19
Proceeds from issuance of private placement			$ 155.0
Subsequent Event. | Common Stock
Proceeds from issuance of private placement	$ 50.0
Subsequent Event. | Accredited investors
Number of accredited investors | item	1