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Collaboration and License Agreements - Amgen, Inc - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Sep. 28, 2016 USD ($) Agreement $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from the issuance of common stock				$ 60,521,729	$ 56,585,035
Revenues		$ 42,696,636	$ 727,375	125,502,807	$ 4,887,321
Contract liabilities		$ 75,681,868		$ 75,681,868		$ 600
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Common Stock Purchase Agreement | Amgen
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Agreement date	Sep. 28, 2016
Shares issued | shares	3,002,793
Stock issued, price per share | $ / shares	$ 7.16
Collaboration and License agreements | Amgen
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Agreement date	Sep. 28, 2016
Number of agreements | Agreement	2
Collaboration and License agreements | Amgen
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Cash received as due under collaboration agreement	$ 35,000,000
Proceeds from the issuance of common stock	21,500,000
Collaboration and License agreements | Maximum | Amgen
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Option payments, and development, regulatory and sales milestone payments.	$ 617,000,000
AMG 890 (ARO-LPA) and ARO-AMG1 Agreement | Amgen
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenues		$ 0	$ 700,000	$ 300,000	$ 4,900,000
Contract liabilities		0		0
Contract assets		$ 0		$ 0
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