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Summary of Significant Accounting Policies - Goodwill, Income Taxes and VIE (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) party	Dec. 31, 2017 USD ($)
Share-Based Compensation
Number of days prior to the grant that common stock and restricted stock units fair value is determined based on	3 days
Variable Interest Entity
Carrying amount asset	$ 18,472	$ 18,799
Maximum exposure to loss	18,472	18,799
VIE's assets	$ 51,344	$ 41,936
JV building microwave communication networks in US and Asia
Variable Interest Entity
Number of other investors in JV | party	9
Ownership of voting shares of JV held be each investor (as a percent)	11.00%
Ownership of equity of JV held be each investor (as a percent)	11.00%
JV building microwave communication networks in US and Europe
Variable Interest Entity
Ownership of voting shares (as a percent)	50.00%
Ownership interest (as a percent)	50.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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