Share-based compensation arrangement by share-based payment award vested options purchased.

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ 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=116856206&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=116856206&loc=d3e5070-113901

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ 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=116856206&loc=d3e5070-113901

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- 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=116856206&loc=d3e5070-113901

+ Details

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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

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

Number of shares issued under share-based payment arrangement.

+ 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=116856206&loc=d3e5070-113901

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Shareholder's Equity and Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		856,939
2016 Incentive Award Plan \| Granted to Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees		778,986	722,200
2016 Incentive Award Plan \| Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted			33,801
2016 Incentive Award Plan \| Vesting After Four Years \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		10,000	443,000
Award vesting period		4 years	4 years
2016 Incentive Award Plan \| Vesting After Four Years \| Restricted Stock Units (RSU)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		4 years	4 years
Shares granted		190,310	279,200
2016 Incentive Award Plan \| Vesting After One Year
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		5,000
Award vesting period		1 year
2016 Incentive Award Plan \| Vesting After One Year \| Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		38,832
Award vesting period		1 year
2016 Incentive Award Plan \| Fully-vested Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		551,676
2016 Incentive Award Plan \| Vesting in Twelve Equal Monthly Installments
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		22,000
2014 Incentive Award Plan \| Stock Options \| MPI \| Tender Offer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vested options purchased by related party	229,431
2014 Incentive Award Plan \| Stock Options \| MPI \| Selling, General and Administrative Expenses \| Tender Offer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 5.1	$ 5.1