Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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=116856206&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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Purchase price of common stock expressed as a percentage of its fair value.

No definition available.

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Share-based Compensation Arrangement By Share-based Payment Award, Maximum Purchase Value During Offering Period, Per Employee

No definition available.

Name:	wk_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumPurchaseValueDuringOfferingPeriodPerEmployee
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Share-based Compensation Arrangement by Share-based Payment Award, Stock Plan Offering Period

No definition available.