Number of tranches for recognition of Expenses associated with share based compensation arrangements.

No definition available.

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- 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://www.xbrl.org/2003/role/presentationRef
-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=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Period Type:	duration

- 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://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

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Data Type:	na
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Share-Based Compensation - Performance Contingent Awards (Details) $ in Thousands	1 Months Ended	3 Months Ended				12 Months Ended
	Aug. 31, 2016 USD ($)	Mar. 31, 2018 USD ($) tranche	Sep. 30, 2017 USD ($) tranche shares	Mar. 31, 2017 USD ($) shares	Mar. 31, 2016 shares	Dec. 31, 2017 USD ($)
Share-Based Compensation
Number of tranches \| tranche		3
Share-based compensation expense		$ 13,998		$ 10,269
Research and development
Share-Based Compensation
Share-based compensation expense	$ 13,300	6,559		5,101
Selling, general and administrative
Share-Based Compensation
Share-based compensation expense	$ 22,200	7,439		$ 5,168
Performance-Contingent Awards - RSUs
Share-Based Compensation
Shares approved for grant (in shares) \| shares			50,000
Number of tranches \| tranche			2
Performance-based vesting
Share-Based Compensation
Shares approved for grant (in shares) \| shares					1,575,000
Vesting period					5 years
Awards outstanding (in shares) \| shares				1,305,000
RSUs
Share-Based Compensation
Shares approved for grant (in shares) \| shares					135,000
Vesting period					5 years
Awards outstanding (in shares) \| shares				135,000
Maximum potential expense
Share-Based Compensation
Share-based compensation expense		35,500
First tranche
Share-Based Compensation
Share-based compensation expense		1,100		$ 400
First tranche \| Performance-Contingent Awards - RSUs
Share-Based Compensation
Share-based compensation expense		400				$ 400
First tranche \| Maximum potential expense \| Performance-Contingent Awards - RSUs
Share-Based Compensation
Share-based compensation expense			$ 800
Second tranche
Share-Based Compensation
Share-based compensation expense		900
Second tranche \| Performance-Contingent Awards - RSUs
Share-Based Compensation
Share-based compensation expense		0
Third tranche
Share-Based Compensation
Share-based compensation expense		$ 0		$ 0