Stockholders' Equity - Additional Information (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	125,000,000
Common stock, par value	$ 0.0001	$ 0.0001