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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 23,818 $ 62,780
Available-for-sale securities 28,758  
Prepaid expenses and other current assets 810 772
Total current assets 53,386 63,552
Property and equipment, net 770 504
Restricted cash 113 113
Total assets 54,269 64,169
Current liabilities:    
Accounts payable 1,626 1,328
Accrued expenses 2,615 3,278
Current portion of notes payable, net of discount 3,190 3,173
Total current liabilities 7,431 7,779
Deferred rent, net of current portion 13 26
Note payable, net of current portion and discount 4,917 5,720
Other liability 184 151
Total liabilities $ 12,545 $ 13,676
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: 15,361,988 and 15,313,297 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively $ 15 $ 15
Additional paid-in capital 159,123 158,488
Accumulated other comprehensive income 14  
Accumulated deficit (117,428) (108,010)
Total stockholders' equity 41,724 50,493
Total liabilities and stockholders' equity $ 54,269 $ 64,169