Employee stock purchase plan maximum contribution of base compensation through payroll.

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- Definition

Employee stock purchase plan maximum percentage of market value purchase price.

+ References

No definition available.

+ Details

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- Definition

Offering period of employee stock purchase plan.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award number of shares available for issuance under ESPP.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value		$ 5.57	$ 6.73	$ 6.34	$ 8.61
Maximum contribution of base compensation for employee stock purchase plan				15.00%
Offering period of employee stock purchase plan				6 months
Purchase price of common stock percentage of fair market value				85.00%
Issuance of common stock, stock purchase plan, shares	642,124
Shares available for issuance	1,757,876	1,757,876		1,757,876
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of options vested, total		$ 1.6	$ 0.6	$ 4.0	$ 1.5
Unrecognized stock based compensation	$ 55.7	55.7		$ 55.7
Unrecognized stock based compensation, amortized weighted average period				2 years 7 months 6 days
Stock Based Compensation Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation	69.8	69.8		$ 69.8
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation	$ 14.1	$ 14.1		$ 14.1
Unrecognized stock based compensation, amortized weighted average period				2 years 8 months 12 days