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Revolving Credit Facility | 9 Months Ended
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Jun. 30, 2018
Text Block [Abstract] |
Revolving Credit Facility | 12. Revolving Credit Facility The Company had a revolving credit facility with available principal totaling $30.0 million, which was scheduled to terminate on November 2019. The Company terminated this agreement on March 29, 2018, at which time there was no outstanding balance.

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- Definition Revolving line of credit. + References No definition available. + Details
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Namespace Prefix: | srdx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration