Stockholders’ Equity (Deficit) Narrative (Details) - USD ($)							12 Months Ended
	Jan. 07, 2018	Dec. 05, 2017	Jul. 31, 2017	May 10, 2017	Feb. 10, 2017	Oct. 11, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 29, 2017	Feb. 16, 2017
Class of Warrant or Right [Line Items]
Common and preferred shares authorized (in shares)										260,000,000
Common stock, shares authorized (in shares)							250,000,000	155,000,000		250,000,000
Preferred stock, shares authorized (in shares)							10,000,000			10,000,000
Preferred stock, par value (in USD per share)							$ 0.01
Common stock, par value (in USD per share)							$ 0.01	$ 0.01
Net proceeds from sale of common stock							$ 67,784,000	$ 14,700,000	$ 0
Convertible preferred stock
Class of Warrant or Right [Line Items]
Preferred stock, shares authorized (in shares)							10,000,000	10,000,000
Preferred stock, par value (in USD per share)							$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)							0	1,000,000
Shares, issued (in shares)							0	1,000,000
Seattle Genetics, Inc., (“SGEN”)
Class of Warrant or Right [Line Items]
Exercise of warrants (in shares)		8,655,804
Aggregate purchase price of common stock		$ 42,400,000
Funding And Purchase Agreements | Rpi Finance Trust
Class of Warrant or Right [Line Items]
Collaborative arrangement purchase price	$ 175,000,000
Securities Purchase Agreement | Seattle Genetics, Inc., (“SGEN”)
Class of Warrant or Right [Line Items]
Agreement purchase shares of common stock (in shares)			3,000,000		3,000,000
Common stock, par value (in USD per share)					$ 4.90
Gross proceeds from sale of common stock					$ 14,700,000
Warrants term					3 years
Shares that warrants can purchase (in shares)			8,655,804		8,655,804
Fair value of warrants											$ 22,300,000
Private placement | Convertible preferred stock
Class of Warrant or Right [Line Items]
Preferred stock, shares issued (in shares)				1,000,000
Issuance of convertible preferred stock (in USD per share)				$ 125
Proceeds from issuance of convertible preferred stock				$ 125,000,000
Convertible preferred stock, shares issued upon conversion (in shares)				23.10536
Share price (in USD per share)				$ 5.41
Conversion of shares (in shares)			23,105,348	23,105,348
IPO
Class of Warrant or Right [Line Items]
Shares, issued (in shares)							13,225,000
Common stock, par value (in USD per share)						$ 3.00
Gross proceeds from sale of common stock						$ 30,000,000
Shares that warrants can purchase (in shares)						10,000,000
Net proceeds from sale of common stock						$ 28,600,000
Increase in fair value of warrants exercised							$ 102,100,000
Exercise price of warrant (in USD per share)						$ 3.75
Warrants outstanding (in shares)							450,000
IPO | Securities Purchase Agreement
Class of Warrant or Right [Line Items]
Fair value of warrants						$ 7,300,000
Warrant
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)							450,000	18,655,804
Warrant | IPO
Class of Warrant or Right [Line Items]
Warrants exercised (in shares)							9,550,000
Scenario, Previously Reported
Class of Warrant or Right [Line Items]
Common and preferred shares authorized (in shares)										165,000,000
Common stock, shares authorized (in shares)										155,000,000
Preferred stock, shares authorized (in shares)										10,000,000