Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 92,685,912	$ 2,025,338
Prepaid expenses and other current assets	1,162,179	299,089
Total current assets	93,848,091	2,324,427
Deferred financing fees		2,705,184
Total assets	93,848,091	5,029,611
Current liabilities:
Accounts payable and accrued expenses	4,172,723	5,500,735
Total current liabilities	4,172,723	5,500,735
Convertible notes		2,006,881
Put option liability		30,415
Total liabilities	4,172,723	7,538,031
Stockholders' equity:
Preferred stock $0.0001 par value, 5,000,000 shares authorized, none issued and outstanding at December 31, 2012 and June 30, 2013
Common stock $0.0001 par value, 33,750,000 shares authorized at June 30, 2013 and 22,500,000 shares authorized at December 31, 2012, 12,539,031 shares issued and outstanding at June 30, 2013 and 3,476,501 shares issued and outstanding at December 31, 2012	1,254	347
Additional paid-in capital	107,799,653	4,660,488
Accumulated deficit during the development stage	(18,125,539)	(7,169,255)
Total stockholders' equity/(deficit)	89,675,368	(2,508,420)
Total liabilities and stockholders' equity/(deficit)	$ 93,848,091	$ 5,029,611