Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 14,284,054	$ 18,545,702
Marketable securities	17,920,632
Restricted cash	80,000	35,014
Prepaid expenses and other current assets	1,196,136	756,979
Total current assets	33,480,822	19,337,695
Equipment, net	26,170	43,446
In-process research and development	34,200,000	34,200,000
Goodwill	14,869,399	14,869,399
Total assets	82,576,391	68,450,540
Current liabilities
Notes payable -current portion	1,434,756
Accounts payable	1,360,569	641,813
Accrued expenses and other current liabilities	2,524,638	1,645,258
Accrued collaborative expenses		1,222,420
Total current liabilities	5,319,963	3,509,491
Notes payable -noncurrent	8,503,111
Deferred taxes	13,433,760	13,433,760
Other noncurrent liabilities		7,694
Total liabilities	$ 27,256,834	$ 16,950,945
Commitments and contingencies
Stockholders’ equity
Preferred stock; $.0001 par value; 100,000,000 shares authorized; none issued or outstanding as of December 31, 2015 and 2014, respectively
Common stock; $.0001 par value; 125,000,000 shares authorized; 24,721,143 and 18,439,482 shares issued and outstanding as of December 31, 2015 and 2014, respectively	$ 2,472	$ 1,844
Additional paid-in capital	157,129,947	126,228,981
Accumulated deficit	(101,812,862)	(74,731,230)
Total stockholders’ equity	55,319,557	51,499,595
Total liabilities and stockholders’ equity	$ 82,576,391	$ 68,450,540