Description of Business - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended
	Feb. 28, 2014	Jan. 31, 2014	Mar. 31, 2014
Accounting Policies [Abstract]
Reverse stock split of common stock and preferred stock			1-for-32
Underwritten public offering, shares sold		2,972,972
Proceeds from underwritten public offering		$ 55.0
Underwriters partially exercised an overallotment option, shares	345,945
Underwriters partially exercised an overallotment option, additional gross proceeds	6.4
Proceeds from underwritten public offering after fees and commissions	$ 57.0