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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 24,278 $ 62,780
Available-for-sale securities 18,539  
Prepaid expenses and other current assets 912 772
Total current assets 43,729 63,552
Property and equipment, net 718 504
Restricted cash 113 113
Total assets 44,560 64,169
Current liabilities:    
Accounts payable 1,559 1,328
Accrued expenses 2,656 3,278
Current portion of notes payable, net of discount 3,207 3,173
Total current liabilities 7,422 7,779
Deferred rent, net of current portion   26
Note payable, net of current portion and discount 4,109 5,720
Other liability 215 151
Total liabilities 11,746 13,676
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, 150,000,000 shares authorized; 15,381,418 and 15,313,297 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively 15 15
Additional paid-in capital 159,664 158,488
Accumulated other comprehensive income 8  
Accumulated deficit (126,873) (108,010)
Total stockholders' equity 32,814 50,493
Total liabilities and stockholders' equity $ 44,560 $ 64,169