Stockholders' Equity - Summary of RSU Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Restricted Stock Activity [Line Items]
Restricted Stock Units, Granted	750
Granted	$ 9.40	$ 4.09
Restricted Stock Units (RSUs) [Member]
Schedule Of Restricted Stock Activity [Line Items]
Restricted Stock Units, Outstanding and non-vested, Beginning balance	5
Restricted Stock Units, Granted	366
Restricted Stock Units, Outstanding and non-vested, Ending balance	371
Outstanding and non-vested as of December 31, 2013	$ 14.99
Granted	$ 22.96
Outstanding and non-vested as of March 31, 2014	$ 22.85