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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Summary of Activity Related to Gross Unrecognized Tax Benefits
The following table summarizes the activity related to the gross unrecognized tax benefits from January 1, 2017 through June 30, 2017:
Balance as of January 1, 2017
$
3,087

Increases related to prior year tax positions
—

Decreases related to prior year tax positions
(1,720
)
Increases related to current year tax positions
—

Decreases related to current year tax positions
—

Effect of exchange rate changes
85

Balance as of June 30, 2017
$
1,452