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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 16,369 $ 23,596
Available-for-sale securities   14,931
Prepaid expenses and other current assets 1,094 1,001
Total current assets 17,463 39,528
Property and equipment, net 321 568
Restricted cash 113 113
Total assets 17,897 40,209
Current liabilities:    
Accounts payable 773 1,405
Accrued expenses 2,432 3,677
Current portion of notes payable, net of discount 2,479 3,243
Other liability 332  
Total current liabilities 6,016 8,325
Deferred rent, net of current portion 89 53
Notes payable, net of current portion and discount   2,479
Other liability   266
Total liabilities 6,105 11,123
Commitments (Note 9)
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; 23,645,247 and 18,817,572 shares issued and outstanding at December 31, 2017 and 2016, respectively 24 19
Additional paid-in capital 183,202 173,141
Accumulated other comprehensive loss   (4)
Accumulated deficit (171,434) (144,070)
Total stockholders' equity 11,792 29,086
Total liabilities and stockholders' equity $ 17,897 $ 40,209