Share-Based Compensation - Executives (Details) $ in Millions	3 Months Ended
Sep. 30, 2018 USD ($) employee	Jun. 30, 2017 USD ($) shares
Number of Options
Number of executives \| employee	2
Compensation expense, vesting acceleration	$ 0.9
Remaining nonvested options \| shares		150,000
General and administrative
Number of Options
Compensation expense, vesting acceleration	0.4	$ 2.1
Research and development
Number of Options
Compensation expense, vesting acceleration	$ 0.5

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration