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Balance Sheets - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Current Assets:    
Cash and cash equivalents $ 170,886,792 $ 209,917,595
Prepaid expenses and other current assets 3,909,979 2,351,524
Total current assets 174,796,771 212,269,119
Property and equipment, net 878,406 957,226
Prepaid research and development expenses 1,560,607 1,560,607
Deposits 52,320 52,320
Operating lease right-of-use asset 3,166,539  
Total assets 180,454,643 214,839,272
Current liabilities:    
Accounts payable 1,407,548 2,663,579
Accrued bonuses 1,645,619 1,727,184
Accrued expenses 6,599,247 4,273,620
Operating lease liabilities 783,925  
Deferred rent   98,771
Total current liabilities 10,436,339 8,763,154
Noncurrent operating lease liabilities 2,937,327  
Deferred rent, net of current portion   611,623
Total liabilities 13,373,666 9,374,777
Stockholders' equity:    
Preferred stock; $0.001 par value; 5,000,000 shares authorized; no shares issued and outstanding at September 30, 2019 and December 31, 2018
Common stock; $0.001 par value; 100,000,000 shares authorized, 43,359,949 shares issued and outstanding at September 30, 2019; 100,000,000 shares authorized, 43,160,751 shares issued and outstanding at December 31, 2018 43,358 43,159
Additional paid-in capital 410,753,952 405,972,075
Accumulated deficit (243,716,333) (200,550,739)
Total stockholders' equity 167,080,977 205,464,495
Total liabilities and stockholders' equity $ 180,454,643 $ 214,839,272