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Schedule of Changes in Estimated Fair Value of Warrant Liability (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Fair value measurements Significant unobservable inputs [Line Items]
Beginning balance			$ (40,483)
Change in estimated fair value of liability classified warrants	$ (9,272)	$ 7,732	11,035	$ 8,562
Ending balance	(29,442)		(29,442)
Fair Value, Measurements, Recurring [Member] | Level 3
Fair value measurements Significant unobservable inputs [Line Items]
Beginning balance			(40,483)	(17,613)
Reclassification of derivative liability to equity upon exercise of warrants			6
Change in estimated fair value of liability classified warrants			11,035	830
Ending balance	$ (29,442)	$ (16,783)	$ (29,442)	$ (16,783)

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Fair Value Measurements, Significant Unobservable Inputs [Line Items]

+ References

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- Definition

Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair value portion of warrants not settleable in cash classified as equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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