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Balance Sheets - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Current Assets:    
Cash and cash equivalents $ 123,924,738 $ 40,041,641
Prepaid expenses and other current assets 3,294,884 478,503
Total current assets 127,219,622 40,520,144
Property and equipment, net 1,106,899 1,056,332
Prepaid research and development expenses 204,364 759,531
Deposits 52,320 52,320
Total assets 128,583,205 42,388,327
Current liabilities:    
Accounts payable 2,647,091 1,565,210
Accrued bonuses 1,883,051 1,432,485
Accrued expenses 3,566,607 3,267,371
Deferred rent 78,028 68,551
Total current liabilities 8,174,777 6,333,617
Deferred rent, net of current portion 707,003 753,579
Total liabilities 8,881,780 7,087,196
Stockholders' equity:    
Preferred stock; $0.001 par value; 5,000,000 shares authorized; no shares issued and outstanding at December 31, 2017 and December 31, 2016
Common stock; $0.001 par value; 100,000,000 shares authorized, 34,359,799 shares issued and outstanding at December 31, 2017; 100,000,000 shares authorized, 23,250,023 shares issued and outstanding at December 31, 2016 34,358 23,249
Additional paid-in capital 271,944,173 154,254,193
Accumulated deficit (152,277,106) (118,976,311)
Total stockholders' equity 119,701,425 35,301,131
Total liabilities and stockholders' equity $ 128,583,205 $ 42,388,327