XML 61 R50.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Stock-based Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Unrecognized compensation costs related to non-vested awards | $ 6,300,000 |  | $ 6,300,000 |  |  |  |
Weighted average period for recognition of compensation costs related to non-vested awards |  |  | 2 years 2 months 12 days |  |  |  |
Performance share awards fully expensed | $ 800,000 |  | $ 800,000 |  |  |  |
Weighted average per share fair value of stock options | $ 13.94 | $ 7.22 | $ 10.42 | $ 7.57 |  |  |
Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |  |  |
Vesting period |  |  |  |  | 3 years | 3 years | 3 years
Total pre-tax intrinsic value of options exercised | $ 6,100,000 |  | $ 9,400,000 |  |  |  |
Fiscal 2015 (2015 - 2017) [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Performance period start year |  |  | 2015 |  |  |  |
Performance period end year |  |  | 2017 |  |  |  |
Fiscal 2016 (2016 - 2018) [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Performance period start year |  |  | 2016 |  |  |  |
Performance period end year |  |  | 2018 |  |  |  |
Fiscal 2017 (2017 - 2019) [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Performance period start year |  |  | 2017 |  |  |  |
Performance period end year |  |  | 2019 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Total pre-tax intrinsic value of options exercised |  | $ 100,000 |  | $ 100,000 |  |  |
Nonqualified Stock Options [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock compensation expenses recognized | $ 400,000 | 300,000 | $ 1,200,000 | $ 900,000 |  |  |
Nonqualified Stock Options [Member] | Board of Director [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock option exercisable on a pro-rata basis |  |  | 1 year |  |  |  |
Nonqualified Stock Options [Member] | Employee [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
Nonqualified Stock Options [Member] | Minimum [Member] | Board of Director [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock option expiration term upon expiration of employment or service |  |  | 7 years |  |  |  |
Nonqualified Stock Options [Member] | Maximum [Member] | Board of Director [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock option expiration term upon expiration of employment or service |  |  | 10 years |  |  |  |
Restricted Stock Awards [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Number of stock units awarded |  |  | 54,068 | 42,522 |  |  |
Number of stock units forfeited |  |  | 10,020 | 1,520 |  |  |
Number of stock units outstanding | 87,745 |  | 87,745 |  | 67,917 |  |
Restricted stock expense | $ 200,000 | 100,000 | $ 700,000 | $ 400,000 |  |  |
Restricted Stock Awards [Member] | Minimum [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Restricted Stock Awards [Member] | Maximum [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock compensation expenses recognized | $ 500,000 | 400,000 | $ 900,000 | 1,000,000 |  |  |
Issuance of shares |  |  | 51,478 |  |  |  |
Performance shares forfeited | 12,217 |  | 12,217 |  |  |  |
Performance Shares [Member] | Fiscal 2016 (2016 - 2018) [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Fair value of performance shares for grants awarded |  |  |  |  |  | $ 1,300,000 |
Performance Shares [Member] | Fiscal 2017 (2017 - 2019) [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Fair value of performance shares for grants awarded |  |  |  |  | $ 1,200,000 |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Issuance of shares |  |  | 84,398 |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Annual compensation withheld, maximum limit |  |  | $ 25,000 |  |  |  |
Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock compensation expenses recognized | $ 100,000 |  | $ 100,000 |  |  |  |
Common stock authorized, shares | 600,000 |  | 600,000 |  |  |  |
Annual compensation withheld |  |  | 10.00% |  |  |  |
Employee contributions | $ 100,000 |  | $ 100,000 |  | $ 100,000 |  |
Restricted Stock Units (RSUs) [Member] | 2009 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock compensation expenses recognized | $ 100,000 | 100,000 | $ 300,000 | $ 200,000 |  |  |
Number of stock units awarded |  |  | 21,265 | 16,004 |  |  |
Number of stock units forfeited |  |  | 257 | 446 |  |  |
Number of stock units outstanding | 60,183 |  | 60,183 |  | 44,440 |  |
Deferred Stock Units [Member] | 2009 Equity Incentive Plan [Member] | Director [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock compensation expenses recognized |  |  | $ 100,000 | $ 100,000 |  |  |
Number of stock units awarded |  |  | 2,075 | 2,953 |  |  |
Number of stock units outstanding | 26,516 |  | 26,516 |  | 24,441 |  |
Deferred Stock Units [Member] | Maximum [Member] | 2009 Equity Incentive Plan [Member] | Director [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Stock compensation expenses recognized | $ 100,000 | $ 100,000 |  |  |  |  |
Number of stock units outstanding estimated fair value |  |  | $ 100,000 | $ 100,000 |  |  |
Vesting Anniversary [Member] | Nonqualified Stock Options [Member] | Employee [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |  |  |
Performance Level [Member] | Minimum [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Vesting percentage |  |  | 20.00% |  |  |  |
Performance Level [Member] | Maximum [Member] |  |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |  |
Performance share awards, estimated vesting percentage |  |  | 200.00% |  |  |  |

X
- Definition Percentage of annual compensation an employee can withhold from their salary to be used under our employee stock purchase program. + References No definition available. + Details
Name: | srdx_AnnualCompensationWithheld
Namespace Prefix: | srdx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount represents the employee contributions included in accrued liabilities for future purchases related to the employee stock purchase program. + References No definition available. + Details
Name: | srdx_EmployeeContributions
Namespace Prefix: | srdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum limit of annual compensation available to be withheld at employee's request to be used to purchase shares of common stock under our employee stock purchase plan. + References No definition available. + Details
Name: | srdx_MaximumLimit
Namespace Prefix: | srdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of target number of shares expected to vest. + References No definition available. + Details
Name: | srdx_PercentageOfTargetNumberOfSharesExpectedToVest
Namespace Prefix: | srdx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The unrecognized compensation cost includes amounts based on payout levels associated with performance share awards that are currently anticipated to be fully expensed because the performance conditions are expected to be met at or near target levels. + References No definition available. + Details
Name: | srdx_PerformanceShareAwardsFullyExpensed
Namespace Prefix: | srdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Final year of a performance share award agreement with key employees. + References No definition available. + Details
Name: | srdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardsAnnualPerformancePeriodEndingYear
Namespace Prefix: | srdx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition First year of a performance share award agreement with key employees. + References No definition available. + Details
Name: | srdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardsAnnualPerformancePeriodStartingYear
Namespace Prefix: | srdx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock-based compensation activity. + References No definition available. + Details
Name: | srdx_StockBasedCompensationActivityLineItems
Namespace Prefix: | srdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_RestrictedStockExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardDateAxis=srdx_PeriodTwentyFifteenThroughTwentySeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=srdx_PeriodTwentySixteenThroughTwentyEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=srdx_PeriodTwentySeventeenThroughTwentyNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=srdx_NonqualifiedStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srdx_BoardOfDirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srdx_EmployeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=srdx_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=srdx_EquityIncentivePlan2009Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=srdx_DeferredStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=srdx_VestingAnniversaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |