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BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 14,104 | $ 8,061
Short-term investments available-for-sale | 4,205 | 23,615
Accounts receivables | 1,965 | 54
Unbilled receivables | 1,836 |
Prepaid expenses | 2,441 | 1,342
Other current assets | 1,558 | 265
Total current assets | 26,109 | 33,337
Property and equipment, net | 6,857 | 8,206
Goodwill | 33,141 | 33,141
Other non-current assets | 469 | 160
Total assets | 66,576 | 74,844
Current liabilities: |  |
Accounts payable | 2,645 | 3,572
Accrued expenses and other current liabilities | 4,528 | 6,273
Current portion of notes payable | 20 | 80
Deferred rent | 386 | 341
Total current liabilities | 7,579 | 10,266
Warrant liability | 368 | 2,842
Deferred revenue | 2,500 |
Non-current portion of notes payable | 300 | 320
Deferred rent | 1,980 | 2,366
Total liabilities | 12,727 | 15,794
Commitments and contingences |  |
Stockholders' equity: |  |
Preferred stock, $0.01 par value, 2,000,000 shares authorized; no shares issued and outstanding |  |
Common stock, $0.01 par value, 200,000,000 shares authorized; and 117,480,867 shares issued and 117,025,437 shares outstanding at December 31, 2011 and 111,492,014 shares issued and 111,036,584 shares outstanding at December 31, 2010 | 1,175 | 1,115
Additional paid-in capital | 383,948 | 371,477
Notes receivable from former directors |  | (1,572)
Accumulated deficit | (329,656) | (310,292)
Treasury stock, 455,430 shares, cost basis | (2,450) | (2,450)
Accumulated other comprehensive income | 832 | 772
Total stockholders' equity | 53,849 | 59,050
Total liabilities and stockholders' equity | $ 66,576 | $ 74,844

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- Definition Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities and which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. 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