Loss Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of issued and outstanding class of stock	1	1	1	1
Common Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options, common stock warrants and unvested restricted stock excluded from calculations of net earning per share	480,914	711,989	469,463	676,051
Unvested Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options, common stock warrants and unvested restricted stock excluded from calculations of net earning per share	30,000		25,000
Common Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options, common stock warrants and unvested restricted stock excluded from calculations of net earning per share	45,045		45,045