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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 17,585 $ 7,599
Marketable securities available-for-sale 71,576 117,531
Accounts receivable 2,025 1,005
Prepaid expenses and other current assets 1,241 2,052
Total current assets 92,427 128,187
Property and equipment, net 8,038 7,965
Goodwill 2,436 2,475
Restricted cash 648 652
Other assets 463 473
Total assets 104,012 139,752
Current liabilities:    
Accounts payable 1,253 2,166
Accrued liabilities 7,307 10,063
Deferred revenues 6,346 6,785
Total current liabilities 14,906 19,014
Deferred revenues, noncurrent 3,820 5,283
Other long-term liabilities 627 629
Total liabilities 19,353 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 June 30, 2013 and December 31, 2012      
Common stock: $0.001 par value; 350,000 and 250,000 shares authorized at June 30, 2013 and December 31, 2012, respectively; 182,988 and 182,792 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively 183 183
Additional paid-in capital 558,766 550,729
Accumulated other comprehensive loss:    
Unrealized gain on marketable securities available-for-sale 4 45
Cumulative translation adjustment (814) (640)
Total accumulated other comprehensive loss (810) (595)
Accumulated deficit (473,480) (435,491)
Total stockholders' equity 84,659 114,826
Total liabilities and stockholders' equity $ 104,012 $ 139,752