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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 2,113 $ 4,364
Short-term investments 32,739 32,192
Accounts receivable, net 353 148
Inventory 924 567
Prepaid expenses and other current assets 1,052 1,104
Total current assets 37,181 38,375
Long-term investments 10,824 13,926
Property and equipment, net 697 706
Goodwill 23,134 23,134
Intangible assets, net 1,405 1,655
Other assets 204 193
Total assets 73,445 77,989
Current liabilities    
Accounts payable 825 276
Accrued expenses and other liabilities 1,845 1,909
Deferred revenue 155 170
Total current liabilities 2,825 2,355
Long-term liabilities 224 216
Commitments and contingencies (Note 3)      
Stockholders' equity    
Preferred stock, $0.01 par value; 20,000 shares authorized; none issued and outstanding      
Common stock, $0.01 par value; 120,000 shares authorized; 49,478 shares and 48,894 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively 495 489
Additional paid-in capital 195,791 192,723
Accumulated other comprehensive income 4 13
Accumulated deficit (125,894) (117,807)
Total stockholders' equity 70,396 75,418
Total liabilities and stockholders' equity $ 73,445 $ 77,989