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CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 44,513 $ 43,985
Accounts receivable, net 4,821 3,619
Inventories 2 2
Deferred tax assets 189 168
Prepaid expenses and other current assets 1,093 401
Total current assets 50,618 48,175
Property and equipment, net 5,140 5,289
Investments 856 1,428
Long term deferred tax assets 737 804
Other assets 425 197
Total assets 57,776 55,893
Current liabilities:    
Accounts payable 147 258
Accrued expenses 938 820
Deferred revenue 2,836 2,352
Total current liabilities 3,921 3,430
Long-term deferred revenue $ 183 $ 74
Commitments and contingent liabilities    
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 22,871,039 as of June 30, 2015 and 22,808,761 as of December 31, 2014 $ 229 $ 228
Additional paid-in capital 104,487 103,756
Accumulated other comprehensive loss (69) (29)
Accumulated deficit (50,975) (51,566)
Total stockholders' equity 53,672 52,389
Total liabilities and stockholders' equity $ 57,776 $ 55,893