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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

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