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Bank Debt and Other Debt (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Summary of Bank Debt and Other Debt

    As of December 31,
    2014     2015
DSIT line-of-credit   $ 2,169     $ 979
DSIT borrowings against receivables     262       862
GridSense line-of-credit     1,480      
GridSense borrowings against receivables     379       138
DSIT term loan     205       75
Total bank debt and borrowings against receivables     4,495       2,054
Less non-current portion     76      
Short-term bank credit and current maturities of long-term debt   $ 4,419     $ 2,054