Subsequent Events (Details) - Forecast - Employee Severance - PWS Clinical Development Program Discontinuation - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Apr. 30, 2020	Jun. 30, 2020
Subsequent Event [Line Items]
Restructuring and Related Cost, Employee Positions Eliminated, Percent	30.00%
Estimated termination benefit related costs		$ 1.0

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration