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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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