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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 4,685 $ 4,364
Short-term investments 21,917 32,192
Accounts receivable, net 175 148
Inventories 846 567
Prepaid expenses and other current assets 1,009 1,104
Total current assets 28,632 38,375
Long-term investments 7,055 13,926
Property and equipment, net 961 706
Goodwill 23,134 23,134
Intangible assets, net 905 1,655
Other assets 200 193
Total assets 60,887 77,989
Current liabilities    
Accounts payable 797 276
Accrued expenses and other liabilities 2,320 1,909
Deferred revenue 76 170
Total current liabilities 3,193 2,355
Long-term liabilities 238 216
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; 49,766 shares and 48,894 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively 498 489
Additional paid-in capital 198,503 192,723
Accumulated other comprehensive income (7) 13
Accumulated deficit (141,538) (117,807)
Total stockholders' equity 57,456 75,418
Total liabilities and stockholders' equity $ 60,887 $ 77,989