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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Current assets: |  |  |
Cash and cash equivalents | $ 73,706 | $ 101,659 | [1]
Short-term investments | 19,996 | 19,990 | [1]
Trade and other receivables, net | 4,312 | 3,781 | [1]
Prepaid expenses and other current assets | 2,558 | 1,630 | [1]
Total current assets | 100,572 | 127,060 | [1]
Property and equipment, net | 6,028 | 6,456 | [1]
Other assets | 1,029 | 1,266 | [1]
Total assets | 107,629 | 134,782 | [1]
Current liabilities: |  |  |
Accounts payable | 8,851 | 9,616 | [1]
Accrued and other liabilities | 4,895 | 9,934 | [1]
Deferred revenue | 2,158 | 2,218 | [1]
Interest bearing obligation - current | 4,085 | 5,835 | [1]
Accrued Interest on interest bearing obligations - current | 264 | 2,042 | [1]
Total current liabilities | 20,253 | 29,645 | [1]
Deferred revenue - long-term | 3,636 | 4,105 | [1]
Interest bearing obligations - long-term | 34,658 | 35,150 | [1]
Contingent warrant liabilities | 47,342 | 69,869 | [1]
Total liabilities | 105,889 | 138,769 | [1]
Stockholders' equity (deficit): |  |  |
Common stock, $0.0075 par value, 138,666,666 shares authorized, 106,885,926 and 105,386,216 shares outstanding at March 31, 2014 and December 31, 2013, respectively | 799 | 787 | [1]
Additional paid-in capital | 1,086,798 | 1,076,403 | [1]
Accumulated comprehensive income (loss) | 6 | (1) | [1]
Accumulated deficit | (1,085,863) | (1,081,176) | [1]
Total stockholders' equity (deficit) | 1,740 | (3,987) | [1]
Total liabilities and stockholders' equity (deficit) | $ 107,629 | $ 134,782 | [1]
[1] | (Note 1) The condensed consolidated balance sheet as of December 31, 2013 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

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