Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets    
Cash and cash equivalents $ 16,762 $ 32,318
Restricted cash 1,100
Marketable securities 51,003 19,002
Trade date receivables 5,003
Prepaid expenses and other current assets 489 2,758
Total current assets 74,357 54,078
Property and equipment, net 1,970 403
Long-term investments 8,200
Other long-term assets 360 109
Total assets 84,887 54,590
Liabilities and stockholders’ deficit    
Accounts payable and accrued expenses 6,444 4,906
Current portion of convertible notes 1,369
Current portion of term notes 2,041
Current portion of capital lease obligation 157 26
Other current liabilities 41
Total current liabilities 6,642 8,342
Convertible notes, net 91,170 7,412
Term notes, net 11,118
Derivative and warrant liability 4,618 37,839
Other long-term liabilities 1,153
Total liabilities 103,583 64,711
Commitments and contingencies (Note G)
Stockholders' deficit:    
Common stock, $0.0001 par value, 250,000,000 shares authorized, 14,646,982 shares issued and outstanding as of December 31, 2016; 14,490,954 shares issued and outstanding as of December 31, 2015 1 1
Additional paid-in capital 102,643 94,702
Preferred stock, $0.0001 par value, 10,000,000 shares authorized, no shares issued or outstanding as of December 31, 2016 or December 31, 2015 0 0
Accumulated deficit (121,340) (104,824)
Total stockholders' deficit (18,696) (10,121)
Total liabilities and stockholders' deficit $ 84,887 $ 54,590