Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended
	Feb. 29, 2012	Jan. 31, 2012	Nov. 30, 2012
Equity [Abstract]
Number of shares of common stock sold in public offering		13,333,334
Common stock, public offering price	$ 3.75	$ 3.75
Net proceeds from offering		$ 48,700,000
Number of common stock issued on partial exercise of underwriters' overallotment option	576,358
Maximum value of common stock issuable under agreement			$ 50,000,000