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Condensed Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Assets    
Cash and cash equivalents $ 27,510 $ 32,318
Restricted cash 1,100
Marketable securities 55,134 19,002
Prepaid expenses and other current assets 824 2,758
Total current assets 84,568 54,078
Property and equipment, net 1,105 403
Long-term investments 18,850
Other long-term assets 111 109
Total assets 104,634 54,590
Liabilities and stockholders' equity (deficit)    
Accounts payable and accrued expenses 5,356 4,906
Current portion of convertible notes 1,932 1,369
Current portion of term notes 2,041
Current portion of capital lease obligation 103 26
Total current liabilities 7,391 8,342
Convertible notes, net 90,389 7,412
Term notes, net 11,118
Derivative and warrant liability 6,043 37,839
Other long-term liabilities 478
Total liabilities 104,301 64,711
Commitments and contingencies (Note D)
Stockholders’ deficit:    
Common stock, $0.0001 par value, 250,000,000 shares authorized, 14,646,982 shares issued and outstanding as of June 30, 2016 (unaudited); 14,490,954 shares issued and outstanding as of December 31, 2015 1 1
Additional paid-in capital 98,322 94,702
Preferred stock, $0.0001 par value, 10,000,000 shares authorized, no shares issued or outstanding as of June 30, 2016 (unaudited) or December 31, 2015
Accumulated deficit (97,990) (104,824)
Total stockholders' equity (deficit) 333 (10,121)
Total liabilities and stockholders' equity (deficit) $ 104,634 $ 54,590