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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 10,186 | $ 21,679
Marketable securities | 82,627 | 41,868
Interest receivable | 338 | 190
Accounts receivable | 3,155 | 4,129
Prepaid expenses | 457 | 296
Restricted cash | 320 |
Other current assets | 191 | 203
Total current assets | 97,274 | 68,365
Marketable securities, non-current | 38,663 | 12,584
Property and equipment, net | 1,406 | 1,543
Intangible assets, in-process research and development | 1,870 |
Goodwill | 1,585 |
Other assets | 40 | 41
Total assets | 140,838 | 82,533
Current liabilities: |  |
Accounts payable and accrued liabilities | 4,380 | 4,013
Accrued compensation and employee benefits | 3,194 | 2,473
Escrow liability | 275 |
Deferred revenue | 2,282 | 2,304
Total current liabilities | 10,131 | 8,790
Deferred revenue, non-current | 6,679 | 8,847
Contingent consideration liability | 1,570 |
Deferred tax liability | 748 |
Total liabilities | 19,128 | 17,637
Commitments and contingencies |  |
Stockholders' equity: |  |
Common stock, $0.01 par value; 80,000,000 shares authorized, 62,243,892 and 53,058,525 shares issued and outstanding at December 31, 2013 and 2012, respectively | 622 | 531
Additional paid-in capital | 423,209 | 339,848
Accumulated deficit | (302,133) | (275,509)
Accumulated other comprehensive income | 12 | 26
Total stockholders' equity | 121,710 | 64,896
Total liabilities and stockholders' equity | $ 140,838 | $ 82,533

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