Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended
	May 17, 2013	May 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Deferred offering costs capitalized				$ 1.6
Number of preferred stock converted into common stock		24,026,797	24,026,797
Reverse stock split ratio on preferred and common stock	0.1
IPO
Summary Of Significant Accounting Policies [Line Items]
Deferred offering costs capitalized			$ 0
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment useful lives			2 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment useful lives			5 years