Stockholders' Equity - Summary of Stock Option Activity under Equity Incentive Plan and Warrants Issued Outside Plan (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Options or Warrants, Balance outstanding, Beginning Balance	144,000
Number of Options or Warrants, Granted	1,459,100
Number of Options or Warrants, Exercised	0
Number of Options or Warrants, Cancelled	0
Number of Options or Warrants, Cancelled (unvested)	(42,000)
Number of Options or Warrants, Expired (vested)	0
Number of Options or Warrants, Balance outstanding, Ending Balance	1,561,100	144,000
Number of Options or Warrants, Exercisable, Ending Balance	1,561,100
Weighted Average Exercise Price, Balance outstanding, Beginning Balance	$ 31.80
Weighted Average Exercise Price, Granted	$ 0.80
Weighted Average Exercise Price, Exercised	$ 0
Weighted Average Exercise Price, Cancelled	$ 0
Weighted Average Exercise Price, Cancelled (unvested)	$ 33.11
Weighted Average Exercise Price, Expired (vested)	$ 0
Weighted Average Exercise Price, Balance outstanding, Ending Balance	$ 2.84	$ 31.80
Weighted Average Exercise Price, Exercisable, Ending Balance	$ 2.84
Weighted Average Remaining Contractual Life (in years), Granted	9 years 10 months 24 days
Weighted Average Remaining Contractual Life (in years), Exercised	0 years
Weighted Average Remaining Contractual Life (in years), Cancelled	0 years
Weighted Average Remaining Contractual Life (in years), Cancelled (unvested)	0 years
Weighted Average Remaining Contractual Life (in years), Expired (vested)	0 years
Weighted Average Remaining Contractual Life (in years), Balance	9 years 1 month 6 days	2 years 1 month 6 days
Weighted Average Remaining Contractual Life (in years), Exercisable, Ending Balance	9 years 1 month 6 days