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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
-Paragraph 1
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- References

No definition available.

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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

Unrecognized cost of unvested share-based compensation awards.

+ 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
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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

+ 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)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Number of non-vested options forfeited.

+ References

No definition available.

+ Details

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Stock-Based Compensation (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
Stock-Based Compensation (Details) - USD ($) $ in Thousands	Apr. 24, 2017	Apr. 01, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock-Based Compensation
Allocated share-based compensation expense			$ 2,661	$ 3,262	$ 7,771	$ 8,706
Stock-Based Compensation
Unrecognized stock-based compensation cost, net of estimated forfeiture			16,300		16,300
Research and development expenses
Stock-Based Compensation
Allocated share-based compensation expense			162	297	503	774
Selling, general and administrative expenses
Stock-Based Compensation
Allocated share-based compensation expense			$ 2,499	$ 2,965	$ 7,268	$ 7,932
Employee And Non Employee Stock Option [Member]
Stock-Based Compensation
Stock options and other incentive awards granted (in shares)			27,590	62,600	211,326	1,263,350
Employee Stock Option [Member]
Stock-Based Compensation
Stock options and other incentive awards granted (in shares)		1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares	600,000