Summary of Significant Accounting Policies - Summary of Weighted-Average Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share	730,750	2,576,252	2,572,252
Conversion of preferred stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share		2,439,002	2,439,002
Warrants for Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share		14,000	10,000
Warrants for common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share	106,000
Stock options issued and outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share	624,750	123,250	123,250