Net Loss per Share - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalent shares excluded from the denominator in the diluted loss per share calculation	1,100,000	1,400,000
Stock Option and Restricted Stocks
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalent shares excluded from the denominator in the diluted loss per share calculation	874,000	773,000