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Collaboration and License Agreements - Amgen, Inc - Additional Information (Detail) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) $ / shares shares | Nov. 18, 2016 USD ($) | Sep. 28, 2016 USD ($) Agreement | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Proceeds from the issuance of common stock |  |  |  | $ 12,419,119 | $ 52,231,433
Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Stock issued, price per share | $ / shares | $ 7.16 |  |  | $ 7.16 | $ 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 |  |
ARO-AMG1 Agreement | Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Additional amount of common stock shares agreed to sell upon exercise of option |  |  | $ 5,000,000 |  |
Number of trading days, used to calculate share price of Common Stock, surrounding option exercise date |  |  | 30 days |  |
Deferred revenue | $ 5,000,000 |  |  | $ 5,000,000 |
Deferred revenue amortized into revenue |  |  |  | 2,500,000 |
Collaboration and License agreements |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Cash received as due under collaboration agreement |  |  | $ 35,000,000 |  |
Collaboration and License agreements | Maximum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Option payments, and development, regulatory and sales milestone payments. |  |  | 617,000,000 |  |
Collaboration and License agreements | Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Proceeds from the issuance of common stock |  |  | $ 21,500,000 |  |
ARO-LPA (AMG 890) Agreement | Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Deferred revenue | $ 30,000,000 |  |  | 30,000,000 |
Deferred revenue amortized into revenue |  |  |  | 27,300,000 |
Revenue generated from work orders under services agreement |  |  |  | $ 1,500,000 |
Common Stock Purchase Agreement | Amgen |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Agreement date | Sep. 28, 2016 |  |  |  |
Shares issued | shares | 3,002,793 |  |  | 3,002,793 |
Stock issued, price per share | $ / shares | $ 7.16 |  |  | $ 7.16 |
Proceeds from the issuance of common stock |  | $ 12,500,000 |  |  |
Common Stock Purchase Agreement | Amgen | NASDAQ |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Number of trading days, used to calculate weighted average price of Common Stock, listed in stock market | 30 days |  |  |  |

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