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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents |  | $ 38,690 | $ 43,471 | [1]
Trade and other receivables |  | 480 | 397 | [1]
Prepaid expenses and other current assets |  | 588 | 327 | [1]
Total current assets |  | 39,758 | 44,195 | [1]
Property and equipment, net |  | 74 | 83 | [1]
Long-term equity securities |  | 553 |  |
Other assets |  | 831 | 657 | [1]
Total assets |  | 41,216 | 44,935 | [1]
Current liabilities: |  |  |  |
Accounts payable |  | 1,082 | 1,679 | [1]
Accrued and other liabilities |  | 1,142 | 2,675 | [1]
Income taxes payable | [1] |  | 1,637 |
Unearned revenue recognized under units-of-revenue method – current |  | 171 | 615 | [1]
Contract liabilities |  | 798 | 798 | [1]
Accrued interest on long-term debt – current | [1] |  | 18 |
Total current liabilities |  | 3,193 | 7,422 | [1]
Unearned revenue recognized under units-of-revenue method – non-current |  | 17,592 | 17,123 | [1]
Long-term debt |  | 14,853 | 14,572 | [1]
Other liabilities – non-current |  | 726 | 32 | [1]
Total liabilities |  | 36,364 | 39,149 | [1]
Commitments and Contingencies (Note 10) |  |  |  | [1]
Stockholders’ equity: |  |  |  |
Convertible preferred stock, $0.05 par value, 1,000,000 shares authorized, 5,003 shares issued and outstanding at June 30, 2018 and December 31, 2017 |  |  |  | [1]
Common stock, $0.0075 par value, 277,333,332 shares authorized, 8,379,163 and 8,249,158 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively |  | 63 | 62 | [1]
Additional paid-in capital |  | 1,189,601 | 1,184,783 | [1]
Accumulated deficit |  | (1,184,812) | (1,179,059) | [1]
Total stockholders’ equity |  | 4,852 | 5,786 | [1]
Total liabilities and stockholders’ equity |  | $ 41,216 | $ 44,935 | [1]
[1] | The condensed consolidated balance sheet as of December 31, 2017 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, 2017.

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