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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 27,829,591 $ 66,686,695
Marketable securities 39,504,263 24,652,348
Accounts receivable 21,787 0
Inventory 230,778 0
Prepaid expenses and other current assets 1,554,270 908,574
Total current assets 69,140,689 92,247,617
Marketable securities 0 2,312,949
Property and equipment, net 619,371 382,437
Other assets 64,800 0
Restricted cash 126,595 126,835
Total assets 69,951,455 95,069,838
Current liabilities:    
Accounts payable 1,256,889 875,646
Accrued expenses and other current liabilities 2,549,443 1,947,374
Deferred revenue 81,399 0
Deferred rent, current portion 25,351 24,381
Total current liabilities 3,913,082 2,847,401
Deferred rent, net of current portion 10,561 14,587
Other long term liabilities 0 15,442
Total liabilities 3,923,643 2,877,430
Stockholders' equity:    
Preferred stock, $0.0001 par value; 10,000,000 shares authorized at September 30, 2016 and December 31, 2015; none issued or outstanding at September 30, 2016 and December 31, 2015 0 0
Common stock, $0.0001 par value; 100,000,000 shares authorized at September 30, 2016 and December 31, 2015; 17,970,590 and 17,943,880 shares issued at September 30, 2016 and December 31, 2015, respectively, and 16,518,347 and 15,741,618 shares outstanding at September 30, 2016 and December 31, 2015, respectively 1,652 1,574
Additional paid-in capital 134,757,066 129,367,978
Accumulated other comprehensive income (loss) 14,672 (24,654)
Accumulated deficit (68,745,578) (37,152,490)
Total stockholders' equity 66,027,812 92,192,408
Total liabilities and stockholders' equity $ 69,951,455 $ 95,069,838