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CONSOLIDATED BALANCE SHEETS (unaudited) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 101,058 $ 46,577
Accounts receivable, net 4,317 3,546
Inventories 265 547
Prepaid expenses and other current assets 238 213
Total current assets 105,878 50,883
Property and equipment, net 6,064 6,232
Investments   727
Other assets, net 1 9
Total assets 111,943 57,851
Current liabilities:    
Accounts payable 543 399
Accrued expenses 114 121
Accrued compensation 1,049 868
Accrued professional 226 109
Accrued income taxes 4,083  
Deferred revenue 1,715 1,317
Total current liabilities 7,730 2,814
Long-term deferred revenue 358 462
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 22,260,377 as of June 30, 2012 and 20,622,889 as of December 31, 2011 223 206
Additional paid-in capital 98,218 79,512
Accumulated other comprehensive loss   (20)
Retained earnings (accumulated deficit) 5,414 (25,123)
Total stockholders' equity 103,855 54,575
Total liabilities and stockholders' equity $ 111,943 $ 57,851