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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components - Accrued Expenses/Other Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accrued expenses and other:      
Accrued wages and employee benefits $ 1,076 $ 1,026  
IC development and wafer costs 921 203  
Employee stock purchase plan withholdings 323 357  
Professional fees 158 123  
Capital lease obligation 138    
Deferred revenue 31 4  
Other 17 637  
Total 2,664 2,350  
Other income, net:      
Interest income 114 155 $ 174
Other income (expense), net (20) (12) 35
Total $ 94 $ 143 $ 209