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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components - Accrued Expenses/Other Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued expenses and other:    
Accrued wages and employee benefits $ 1,051 $ 1,076
IC development and wafer costs 598 921
Interest payable 314  
Professional fees and consulting 282 158
Deferred revenue 271 31
Employee stock purchase plan withholdings 200 323
Capital lease obligation   138
Other 57 17
Total $ 2,773 $ 2,664