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Stockholders' Equity - Subsequent Event - Stock Plans (Details) | 6 Months Ended
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Jun. 30, 2017
Stockholders' Equity Note [Abstract] |
Threshold consecutive trading days | 20 days

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- Definition Performance-based Restricted Stock, Threshold Consecutive Trading Days + References No definition available. + Details
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Namespace Prefix: | sncr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration