Related Party Transactions	12 Months Ended
Mar. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions (A) Services Agreements: In October 2014, AGT and ASI entered into a services agreement (the "RSI Services Agreement") with Roivant Sciences, Inc. ("RSI"), a wholly owned subsidiary of RSL, under which RSI agreed to provide certain administrative and research and development services to AGT and ASI. AGT and ASI amended and restated the RSI Services Agreement with RSI on October 13, 2015, effective for the fiscal year commencing April 1, 2015. Under the RSI Services Agreement, as amended and restated, AGT and ASI pay or reimburse RSI for any expenses it, or third parties acting on its behalf, incurs for AGT and ASI. For any general and administrative and research and development activities performed by RSI employees, RSI charges back the employee compensation expense plus a predetermined mark-up. Employee compensation expense, inclusive of base salary and fringe benefits, is determined based upon the relative percentage of time utilized on AGT and ASI matters. All other costs are billed back at cost. In February 2017, AGT and ASI amended and restated the RSI Services Agreement, effective as of December 13, 2016, to add ASG as a services recipient. In addition, in February 2017, ASG entered into a separate services agreement with Roivant Sciences GmbH ("RSG"), a wholly owned subsidiary of RSL, effective as of December 13, 2016 (the "RSG Services Agreement"), for the provision of services by RSG to ASG in relation to the identification of potential product candidates and project management of clinical trials, as well as other services related to development, administrative and financial activities. In June 2019, both the RSI Services Agreement and the RSG Services Agreement were amended, whereby RSI and RSG, respectively, as service providers, have agreed to indemnify AGT, ASI and ASG and each of their officers, employees and directors against all losses arising out of, due to or in connection with the provision of services (or the failure to provide services) under the applicable services agreement, subject to certain limitations set forth in the applicable services agreement. In addition, AGT, ASI and ASG have agreed to indemnify RSI and RSG, respectively, and their respective affiliates and officers, employees and directors against all losses arising out of, due to or in connection with the receipt of services under the applicable services agreement, subject to certain limitations set forth in the applicable services agreement. Such indemnification obligations will not exceed the payments made by AGT, ASI and ASG under the applicable services agreement for the specific service that allegedly caused or was related to the losses during the period in which such alleged losses were incurred. The term of each of the services agreements will continue until terminated upon 90 days’ written notice by any party with respect to the services such party provides or receives thereunder. Under the RSI Services Agreement and the RSG Services Agreement, the Company incurred expenses of $0.1 million and $5.1 million for the years ended March 31, 2020 and 2019, respectively, inclusive of the mark-up. (B) Information Sharing and Cooperation Agreement: In March 2015, the Company entered into an information sharing and cooperation agreement with RSL, as amended and restated in June 2018 (the "Restated Cooperation Agreement") in connection with a share purchase placement agreement with RSL (the "Private Placement"), for which the amendments became effective in July 2018 upon the closing of the Private Placement. The Restated Cooperation Agreement, among other things, obligates the Company to deliver periodic financial statements and other financial information to RSL and comply with other specified financial reporting requirements, and requires the Company to implement and observe certain policies and procedures related to applicable laws and regulations. The Company agreed to indemnify RSL and its affiliates and their respective officers, employees and directors against all losses arising out of, due to or in connection with RSL’s status as a shareholder under the Restated Cooperation Agreement and the operations of or services provided by RSL or its affiliates or their respective officers, employees or directors to the Company or any of its subsidiaries, subject to certain limitations set forth in the Restated Cooperation Agreement. Subject to specified exceptions, the Restated Cooperation Agreement will terminate at such time as RSL is no longer required (a) under U.S. GAAP to consolidate the Company's results of operations and financial position, (b) under U.S. GAAP to account for its investment in the Company under the equity method of accounting, or (c) otherwise to include separate financial statements of the Company in its filings with the SEC pursuant to any SEC rule. In addition, the Cooperation Agreement may be terminated upon mutual written consent of the parties or upon written notice from RSL to the Company in the event of the Company's bankruptcy, liquidation, dissolution or winding-up. (C) RSL Financings: In July 2018, the Company received $25.0 million of net proceeds from RSL in exchange for the issuance and sale of 1,785,714 of the Company's common shares to RSL at a purchase price of $14.00 per common share, which was the closing price per share of the Company's common shares on the Nasdaq Global Select Market on June 5, 2018, the date of the share purchase agreement (see Note 9(B)). In December 2018, the Company issued and sold 4,145,115 common shares in a follow-on public offering, including 395,115 common shares sold pursuant to the exercise of the underwriters’ option to purchase additional shares and 1,250,000 shares issued and sold to RSL, at an offering price of $8.00 per common share for gross proceeds of $33.2 million. The aggregate net proceeds to the Company were approximately $31.6 million, after deducting underwriting discounts and commissions and offering expenses incurred (see Note 9(B)). In March 2019, the Company issued and sold 3,333,333 common shares at an offering price of $12.00 per common share for gross proceeds of $40.0 million, including 833,333 shares issued and sold to RSL. The aggregate net proceeds to the Company were approximately $37.9 million, after deducting underwriting discounts and commissions and offering expenses incurred (see Note 9(B)). In February 2020, the Company issued and sold 16,631,336 common shares and pre-funded warrants to purchase up to 3,301,998 common shares in a follow-on public offering, including 2,600,000 common shares sold pursuant to the exercise of the underwriters’ option to purchase additional shares, at an offering price of $3.75 per common share and $3.74999 per pre-funded warrant, including 5,333,333 shares issued and sold to RSL. The net proceeds to the Company were approximately $70.8 million, after deducting underwriting discounts and commissions and offering expenses incurred (see Note 9(B)).

Related Party Transactions

(A) Services Agreements:

In October 2014, AGT and ASI entered into a services agreement (the "RSI Services Agreement") with Roivant Sciences, Inc. ("RSI"), a wholly owned subsidiary of RSL, under which RSI agreed to provide certain administrative and research and development services to AGT and ASI. AGT and ASI amended and restated the RSI Services Agreement with RSI on October 13, 2015, effective for the fiscal year commencing April 1, 2015. Under the RSI Services Agreement, as amended and restated, AGT and ASI pay or reimburse RSI for any expenses it, or third parties acting on its behalf, incurs for AGT and ASI. For any general and administrative and research and development activities performed by RSI employees, RSI charges back the employee compensation expense plus a predetermined mark-up. Employee compensation expense, inclusive of base salary and fringe benefits, is determined based upon the relative percentage of time utilized on AGT and ASI matters. All other costs are billed back at cost.

In February 2017, AGT and ASI amended and restated the RSI Services Agreement, effective as of December 13, 2016, to add ASG as a services recipient. In addition, in February 2017, ASG entered into a separate services agreement with Roivant Sciences GmbH ("RSG"), a wholly owned subsidiary of RSL, effective as of December 13, 2016 (the "RSG Services Agreement"), for the provision of services by RSG to ASG in relation to the identification of potential product candidates and project management of clinical trials, as well as other services related to development, administrative and financial activities. In June 2019, both the RSI Services Agreement and the RSG Services Agreement were amended, whereby RSI and RSG, respectively, as service providers, have agreed to indemnify AGT, ASI and ASG and each of their officers, employees and directors against all losses arising out of, due to or in connection with the provision of services (or the failure to provide services) under the applicable services agreement, subject to certain limitations set forth in the applicable services agreement. In addition, AGT, ASI and ASG have agreed to indemnify RSI and RSG, respectively, and their respective affiliates and officers, employees and directors against all losses arising out of, due to or in connection with the receipt of services under the applicable services agreement, subject to certain limitations set forth in the applicable services agreement. Such indemnification obligations will not exceed the payments made by AGT, ASI and ASG under the applicable services agreement for the specific service that allegedly caused or was related to the losses during the period in which such alleged losses were incurred. The term of each of the services agreements will continue until terminated upon 90 days’ written notice by any party with respect to the services such party provides or receives thereunder.

Under the RSI Services Agreement and the RSG Services Agreement, the Company incurred expenses of $0.1 million and $5.1 million for the years ended March 31, 2020 and 2019, respectively, inclusive of the mark-up.

(B) Information Sharing and Cooperation Agreement:

In March 2015, the Company entered into an information sharing and cooperation agreement with RSL, as amended and restated in June 2018 (the "Restated Cooperation Agreement") in connection with a share purchase placement agreement with RSL (the "Private Placement"), for which the amendments became effective in July 2018 upon the closing of the Private Placement. The Restated Cooperation Agreement, among other things, obligates the Company to deliver periodic financial statements and other financial information to RSL and comply with other specified financial reporting requirements, and requires the Company to implement and observe certain policies and procedures related to applicable laws and regulations. The Company agreed to indemnify RSL and its affiliates and their respective officers, employees and directors against all losses arising out of, due to or in connection with RSL’s status as a shareholder under the Restated Cooperation Agreement and the operations of or services provided by RSL or its affiliates or their respective officers, employees or directors to the Company or any of its subsidiaries, subject to certain limitations set forth in the Restated Cooperation Agreement.

Subject to specified exceptions, the Restated Cooperation Agreement will terminate at such time as RSL is no longer required (a) under U.S. GAAP to consolidate the Company's results of operations and financial position, (b) under U.S. GAAP to account for its investment in the Company under the equity method of accounting, or (c) otherwise to include separate financial statements of the Company in its filings with the SEC pursuant to any SEC rule. In addition, the Cooperation Agreement may be terminated upon mutual written consent of the parties or upon written notice from RSL to the Company in the event of the Company's bankruptcy, liquidation, dissolution or winding-up.

In July 2018, the Company received $25.0 million of net proceeds from RSL in exchange for the issuance and sale of 1,785,714 of the Company's common shares to RSL at a purchase price of $14.00 per common share, which was the closing price per share of the Company's common shares on the Nasdaq Global Select Market on June 5, 2018, the date of the share purchase agreement (see Note 9(B)).

In December 2018, the Company issued and sold 4,145,115 common shares in a follow-on public offering, including 395,115 common shares sold pursuant to the exercise of the underwriters’ option to purchase additional shares and 1,250,000 shares issued and sold to RSL, at an offering price of $8.00 per common share for gross proceeds of $33.2 million. The aggregate net proceeds to the Company were approximately $31.6 million, after deducting underwriting discounts and commissions and offering expenses incurred (see Note 9(B)).

In March 2019, the Company issued and sold 3,333,333 common shares at an offering price of $12.00 per common share for gross proceeds of $40.0 million, including 833,333 shares issued and sold to RSL. The aggregate net proceeds to the Company were approximately $37.9 million, after deducting underwriting discounts and commissions and offering expenses incurred (see Note 9(B)).

In February 2020, the Company issued and sold 16,631,336 common shares and pre-funded warrants to purchase up to 3,301,998 common shares in a follow-on public offering, including 2,600,000 common shares sold pursuant to the exercise of the underwriters’ option to purchase additional shares, at an offering price of $3.75 per common share and $3.74999 per pre-funded warrant, including 5,333,333 shares issued and sold to RSL. The net proceeds to the Company were approximately $70.8 million, after deducting underwriting discounts and commissions and offering expenses incurred (see Note 9(B)).