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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 21,071,684 $ 22,416,040
Marketable securities 31,743,086 38,658,933
Accounts receivable 19,062 12,181
Inventory 414,322 454,132
Prepaid expenses and other current assets 1,585,715 925,983
Total current assets 54,833,869 62,467,269
Property and equipment, net 479,266 556,315
Other assets 64,800 64,800
Restricted cash 126,595 126,595
Total assets 55,504,530 63,214,979
Current liabilities:    
Accounts payable 818,794 1,192,183
Accrued expenses and other current liabilities 2,311,405 2,587,573
Deferred revenue 80,637 88,344
Deferred rent, current portion 7,579 21,095
Total current liabilities 3,218,415 3,889,195
Deferred rent, net of current portion 59,111 8,398
Total liabilities 3,277,526 3,897,593
Stockholders' equity:    
Preferred stock, $0.0001 par value; 10,000,000 shares authorized at March 31, 2017 and December 31, 2016; none issued or outstanding at March 31, 2017 and December 31, 2016 0 0
Common stock, $0.0001 par value; 100,000,000 shares authorized at March 31, 2017 and December 31, 2016; 17,970,590 shares issued at March 31, 2017 and December 31, 2016, and 17,029,249 and 16,773,798 shares outstanding at March 31, 2017 and December 31, 2016, respectively 1,703 1,678
Additional paid-in capital 137,151,662 135,962,935
Accumulated other comprehensive loss (12,353) (1,614)
Accumulated deficit (84,914,008) (76,645,613)
Total stockholders' equity 52,227,004 59,317,386
Total liabilities and stockholders' equity $ 55,504,530 $ 63,214,979