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Balance Sheets - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Current Assets:    
Cash and cash equivalents $ 195,560,926 $ 209,917,595
Prepaid expenses and other current assets 2,828,959 2,351,524
Total current assets 198,389,885 212,269,119
Property and equipment, net 962,241 957,226
Prepaid research and development expenses 1,560,607 1,560,607
Deposits 52,320 52,320
Operating lease right-of-use asset 3,476,452  
Total assets 204,441,505 214,839,272
Current liabilities:    
Accounts payable 1,866,937 2,663,579
Accrued bonuses 517,361 1,727,184
Accrued expenses 5,182,626 4,273,620
Operating lease liabilities 739,930  
Deferred rent   98,771
Total current liabilities 8,306,854 8,763,154
Noncurrent operating lease liabilities 3,341,056  
Deferred rent, net of current portion   611,623
Total liabilities 11,647,910 9,374,777
Stockholders' equity:    
Preferred stock; $0.001 par value; 5,000,000 shares authorized; no shares issued and outstanding at March 31, 2019 and December 31, 2018
Common stock; $0.001 par value; 100,000,000 shares authorized, 43,180,169 shares issued and outstanding at March 31, 2019; 100,000,000 shares authorized, 43,160,751 shares issued and outstanding at December 31, 2018 43,179 43,159
Additional paid-in capital 407,385,052 405,972,075
Accumulated deficit (214,634,636) (200,550,739)
Total stockholders' equity 192,793,595 205,464,495
Total liabilities and stockholders' equity $ 204,441,505 $ 214,839,272