Summarized Quarterly Data - Summarized Quarterly Data (Detail) (USD $)	3 Months Ended								11 Months Ended	12 Months Ended						83 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2007	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Research and development expense	$ 636,423	$ 78,731	$ 130,846	$ 110,981	$ 318,347	$ 337,003	$ 213,010	$ 297,285		$ 956,980	$ 1,165,645	$ 1,844,044				$ 16,948,509
General and administrative expense	944,359	406,862	72,578	221,049	343,570	140,746	147,328	205,137		1,644,848	836,781	570,524				4,949,381
Net loss	$ (1,616,698)	$ (485,904)	$ (239,871)	$ (493,992)	$ (672,450)	$ (486,254)	$ (358,666)	$ (500,158)	$ (2,009,591)	$ (2,836,465)	$ (2,017,528)	$ (2,401,244)	$ (5,039,338)	$ (5,159,638)	$ (3,227,664)	$ (22,691,468)
Net loss per share, basic and diluted	$ (0.27)	$ (0.41)	$ (0.21)	$ (0.44)	$ (0.60)	$ (0.43)	$ (0.32)	$ (0.45)		$ (1.20)	$ (1.79)	$ (2.18)
Weighted average shares outstanding, basic and diluted	5,971,236	1,190,212	1,137,125	1,133,375	1,129,625	1,125,875	1,122,125	1,118,375		2,368,006	1,124,000	1,102,625