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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 29,369 $ 23,596
Available-for-sale securities   14,931
Prepaid expenses and other current assets 892 1,001
Total current assets 30,261 39,528
Property and equipment, net 442 568
Restricted cash 113 113
Total assets 30,816 40,209
Current liabilities:    
Accounts payable 2,055 1,405
Accrued expenses 2,796 3,677
Current portion of notes payable, net of discount 3,278 3,243
Total current liabilities 8,129 8,325
Deferred rent, net of current portion   53
Notes payable, net of current portion and discount 831 2,479
Other liability 306 266
Total liabilities 9,266 11,123
Commitments (Note 7)
Stockholders' equity:    
Preferred stock, $0.001 par value per share, 5,000,000 shares authorized and no shares issued and outstanding
Common stock, $0.001 par value per share, 150,000,000 shares authorized; 22,481,735 and 18,817,572 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively 22 19
Additional paid-in capital 180,448 173,141
Accumulated other comprehensive loss   (4)
Accumulated deficit (158,920) (144,070)
Total stockholders' equity 21,550 29,086
Total liabilities and stockholders' equity $ 30,816 $ 40,209