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Consolidated Balance Sheets and Statements of Operations and Comprehensive Income (Loss) Components (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accrued expenses and other liabilities:      
Accrued wages and employee benefits $ 818 $ 881  
Employee stock purchase plan withholdings 286 292  
Professional fees 61 503  
Other 744 2,271  
Total 1,909 3,947  
Other income, net:      
Interest income 174 171 143
Other income (expense), net 35 (16) 63
Total $ 209 $ 155 $ 206