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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 25,016 $ 7,599
Marketable securities available-for-sale 80,357 117,531
Accounts receivable 1,547 1,005
Prepaid expenses and other current assets 1,217 2,052
Total current assets 108,137 128,187
Property and equipment, net 7,972 7,965
Goodwill 2,400 2,475
Restricted cash 644 652
Other assets 468 473
Total assets 119,621 139,752
Current liabilities:    
Accounts payable 1,727 2,166
Accrued liabilities 8,166 10,063
Deferred revenues 7,167 6,785
Total current liabilities 17,060 19,014
Deferred revenues, noncurrent 4,013 5,283
Other long-term liabilities 621 629
Total liabilities 21,694 24,926
Commitments and contingencies (Note 5)      
Stockholders' equity:    
Preferred stock: $0.001 par value; 5,000 shares authorized and no shares issued and outstanding at March 31, 2013 and December 31, 2012      
Common stock: $0.001 par value; 250,000 shares authorized at March 31, 2013 and December 31, 2012; 182,886 and 182,792 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively 183 183
Additional paid-in capital 555,010 550,729
Accumulated other comprehensive loss:    
Unrealized gain (loss) on marketable securities available-for-sale 37 45
Cumulative translation adjustment (987) (640)
Total accumulated other comprehensive loss (950) (595)
Accumulated deficit (456,316) (435,491)
Total stockholders' equity 97,927 114,826
Total liabilities and stockholders' equity $ 119,621 $ 139,752