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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 3,040 $ 4,364
Short-term investments 27,994 32,192
Accounts receivable, net 307 148
Inventories 628 567
Prepaid expenses and other current assets 1,326 1,104
Total current assets 33,295 38,375
Long-term investments 9,106 13,926
Property and equipment, net 613 706
Goodwill 23,134 23,134
Intangible assets, net 1,155 1,655
Other assets 204 193
Total assets 67,507 77,989
Current liabilities    
Accounts payable 764 276
Accrued expenses and other liabilities 2,028 1,909
Deferred revenue 103 170
Total current liabilities 2,895 2,355
Long-term liabilities 232 216
Commitments and contingencies (Note 4)      
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; 49,554 shares and 48,894 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively 496 489
Additional paid-in capital 196,929 192,723
Accumulated other comprehensive income 10 13
Accumulated deficit (133,055) (117,807)
Total stockholders' equity 64,380 75,418
Total liabilities and stockholders' equity $ 67,507 $ 77,989