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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 12,191 $ 7,599
Marketable securities available-for-sale 64,283 117,531
Accounts receivable 2,159 1,005
Prepaid expenses and other current assets 1,120 2,052
Total current assets 79,753 128,187
Property and equipment, net 8,454 7,965
Goodwill 2,532 2,475
Restricted cash 657 652
Other assets 302 473
Total assets 91,698 139,752
Current liabilities:    
Accounts payable 1,289 2,166
Accrued liabilities 8,148 10,063
Deferred revenues 6,126 6,785
Total current liabilities 15,563 19,014
Deferred revenues, noncurrent 2,751 5,283
Other long-term liabilities 988 629
Total liabilities 19,302 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 September 30, 2013 and December 31, 2012      
Common stock: $0.001 par value; 350,000 and 250,000 shares authorized at September 30, 2013 and December 31, 2012, respectively; 183,055 and 182,792 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively 183 183
Additional paid-in capital 561,687 550,729
Accumulated other comprehensive loss:    
Unrealized gain on marketable securities available-for-sale 22 45
Cumulative translation adjustment (341) (640)
Total accumulated other comprehensive loss (319) (595)
Accumulated deficit (489,155) (435,491)
Total stockholders’ equity 72,396 114,826
Total liabilities and stockholders’ equity $ 91,698 $ 139,752