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Organization and Significant Accounting Policies - Revenue Recognition and Sales and Marketing Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue recognition, customer contract period, min	3 months
Revenue recognition, customer contract period, max	36 months
Sales commissions amortization period	12 months
Advertising expense	$ 2.7	$ 2.7	$ 2.8

X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

+ Details

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Balance Type:	debit
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- References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Namespace Prefix:	wk_
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Balance Type:	na
Period Type:	duration