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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 75,418 $ 71,074
Accounts receivable, net 2,754 3,457
Receivable from patent arrangement   1,121
Deferred tax assets 916 817
Prepaid expenses and other current assets 1,093 528
Total current assets 80,181 76,997
Property and equipment, net 5,644 5,904
Investments 2,962 2,010
Intangible assets 201  
Long term deferred tax assets 659 943
Total assets 89,647 85,854
Current liabilities:    
Accounts payable 243 328
Accrued expenses 101 148
Accrued compensation 589 817
Accrued professional 156 142
Due to customers 3,732  
Deferred revenue 1,529 2,204
Total current liabilities 6,350 3,639
Long-term deferred revenue 40 319
Stockholders' equity:    
Preferred stock, $1.00 par value; 1,000,000 shares authorized, none outstanding      
Common stock, $.01 par value; 70,000,000 shares authorized; issued and outstanding 22,570,794 as of September 30, 2013 and 22,509,518 as of December 31, 2012 226 225
Additional paid-in capital 100,917 100,561
Accumulated other comprehensive loss (57) (50)
Accumulated deficit (17,829) (18,840)
Total stockholders' equity 83,257 81,896
Total liabilities and stockholders' equity $ 89,647 $ 85,854