Fair Value Measurements - Reconciliation of Company's Liabilities Measured Using Significant Unobservable Inputs (Detail) (USD $)	12 Months Ended			83 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Beginning balance	$ 56,000	$ 39,000
Warrants issued in connection with loan and security agreement	49,000	24,250
Change in fair value of warrant liability	82,000	(7,250)	(5,500)	54,264
Reclassification to additional paid-in capital at initial public offering	(187,000)
Ending balance		$ 56,000	$ 39,000