Preferred Stock, Common Stock and Stockholders' Equity - Summary of Warrants Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Shares, Outstanding beginning balance	106,000
Shares, Issued	22,881
Shares, Exercised	(10,000)
Shares, Outstanding ending balance	118,881	106,000
Weighted Average Exercise Price, Outstanding beginning balance	$ 18.20
Weighted Average Exercise Price, Issued	$ 5.90
Weighted Average Exercise Price, Exercised	$ 7.50
Weighted Average Exercise Price, Outstanding ending balance	$ 16.73	$ 18.20
Weighted Average Remaining Contractual Term (Years), Outstanding	5 years 4 months 6 days	5 years 1 month 17 days
Weighted Average Remaining Contractual Term (Years), Issued	10 years
Weighted Average Remaining Contractual Term (Years), Exercised	3 years 1 month 6 days