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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

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