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Balance Sheets - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Current Assets:    
Cash and cash equivalents $ 209,917,595 $ 123,924,738
Prepaid expenses and other current assets 2,351,524 3,294,884
Total current assets 212,269,119 127,219,622
Property and equipment, net 957,226 1,106,899
Prepaid research and development expenses 1,560,607 204,364
Deposits 52,320 52,320
Total assets 214,839,272 128,583,205
Current liabilities:    
Accounts payable 2,663,579 2,647,091
Accrued bonuses 1,727,184 1,883,051
Accrued expenses 4,273,620 3,566,607
Deferred rent 98,771 78,028
Total current liabilities 8,763,154 8,174,777
Deferred rent, net of current portion 611,623 707,003
Total liabilities 9,374,777 8,881,780
Stockholders' equity:    
Preferred stock; $0.001 par value; 5,000,000 shares authorized; no shares issued and outstanding at December 31, 2018 and December 31, 2017
Common stock; $0.001 par value; 100,000,000 shares authorized, 43,160,751 shares issued and outstanding at December 31, 2018; 100,000,000 shares authorized, 34,359,799 shares issued and outstanding at December 31, 2017 43,159 34,358
Additional paid-in capital 405,972,075 271,944,173
Accumulated deficit (200,550,739) (152,277,106)
Total stockholders' equity 205,464,495 119,701,425
Total liabilities and stockholders' equity $ 214,839,272 $ 128,583,205