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v3.22.4

Subsequent Events (Details) - Subsequent Event | Mar. 10, 2023 $ / shares
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Subsequent Event [Line Items] |
Sale of stock, percentage of ownership before transcation | 13.90%
B. Riley Financial, Inc. |
Subsequent Event [Line Items] |
Sale of stock, price per share (in dollars per share) | $ 1.15

X
- Definition Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=sncr_BRileyFinancialIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |