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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Current assets    
Cash and cash equivalents $ 36,254,748 $ 82,980,609
Marketable securities 96,675,088  
Restricted cash 80,000 80,000
Prepaid expenses and other current assets 1,072,559 803,241
Total current assets 134,082,395 83,863,850
Marketable securities - noncurrent 10,355,092  
Equipment, net 330 9,640
In-process research and development 34,200,000 34,200,000
Goodwill 14,869,399 14,869,399
Total assets 193,507,216 132,942,889
Current liabilities    
Notes payable - current portion 5,194,337 4,853,753
Accounts payable 1,503,412 1,468,341
Accrued expenses and other current liabilities 2,022,405 815,813
Accrued collaborative expenses - related party   2,547,952
Total current liabilities 8,720,154 9,685,859
Notes payable - noncurrent   3,841,062
Deferred taxes 13,433,760 13,433,760
Deferred revenue 41,175,600  
Total liabilities 63,329,514 26,960,681
Commitments and contingencies
Stockholders’ equity    
Preferred stock; $0.0001 par value; 100,000,000 shares authorized; none issued or outstanding as of September 30, 2017 and December 31, 2016, respectively
Common stock; $0.0001 par value; 125,000,000 shares authorized; 38,700,693 and 35,024,002 shares issued and outstanding as of September 30, 2017 and December 31, 2016, respectively 3,870 3,502
Additional paid-in capital 294,717,361 238,836,940
Accumulated deficit (164,543,529) (132,858,234)
Total stockholders’ equity 130,177,702 105,982,208
Total liabilities and stockholders’ equity $ 193,507,216 $ 132,942,889