Long Term Debt	12 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]
Long Term Debt	Long-term Debt On February 2, 2017, AGT and its subsidiaries, AHL, ASG and ASI entered into a loan and security agreement (as amended on May 24, 2017, September 22, 2017 and November 27, 2019) (the "Loan Agreement") with Hercules, under which the AGT, AHL and ASG (the "Borrowers") borrowed an aggregate of $55.0 million (the "Term Loan"). Subsequently, ASA was added as a Borrower in July 2017, ATH and ATI were added as Borrowers in April 2018 and the Company's affiliate, Roivant Sciences Ltd. ("RSL"), was added as a guarantor in November 2019. Pursuant to the Loan Agreement, ASI and RSL issued guarantees of the Borrowers’ obligations under the Loan Agreement and the Borrowers and ASI granted Hercules a first position lien on substantially all of their respective assets, excluding intellectual property. The Term Loan initially bore interest at a variable per annum rate calculated for any day as the greater of either (i) the prime rate plus 6.80%, and (ii) 10.55%, which was subsequently changed in connection with the November 2019 amendment of the Loan Agreement to a variable per annum rate calculated for any day as the greater of either (i) the prime rate plus 6.80%, and (ii) 11.55%. The Term Loan had a scheduled maturity date of March 1, 2021. The Borrowers were initially obligated to make monthly payments of accrued interest under the Loan Agreement until September 1, 2018, followed by monthly installments of principal and interest beginning October 1, 2018 through March 1, 2021. Subsequent to the November 2019 amendment of the Loan Agreement, the Borrowers were obligated to make monthly payments of accrued interest from December 1, 2019 until August 1, 2020, followed by monthly installments of principal and interest from September 1, 2020 through March 1, 2021. Prepayment of the Term Loan was subject to penalty. The Borrowers prepaid 50%, or approximately $15.7 million, of outstanding principal due without penalty in connection with the November 2019 amendment of the Loan Agreement, which was accounted for as a modification of debt in accordance with applicable accounting guidance. In April 2020, the Company prepaid $15.7 million of outstanding principal, together with $0.3 million of accrued interest, fees and other amounts, due under the Loan Agreement with Hercules. In connection with the prepayment, the credit facility and Loan Agreement with Hercules were terminated, and all obligations, liens and security interests under the Loan Agreement were released, discharged and satisfied (see Note 14). In connection with the Loan Agreement, the Company issued a warrant to Hercules, exercisable for an aggregate of 34,260 of the Company’s common shares at an exercise price of $96.32 per share (the "Warrant"). In August 2017, Hercules exercised the Warrant on a cashless basis and received a net issuance of 16,228 of the Company's common shares. The Warrant was accounted for as an equity instrument since it was indexed to the Company’s common shares and met the criteria for classification in shareholders’ equity. The relative fair value of the Warrant on the date of issuance of approximately $2.3 million was estimated using the Black-Scholes model. In addition, at the closing of the Term Loan, the Company paid transaction costs of $1.5 million. These amounts were recorded as a discount on the debt and were amortized to interest expense using the effective interest method over the life of the Term Loan, which was a period of 48 months, with the remaining unamortized balance upon prepayment in April 2020 charged to interest expense.

Long-term Debt

On February 2, 2017, AGT and its subsidiaries, AHL, ASG and ASI entered into a loan and security agreement (as amended on May 24, 2017, September 22, 2017 and November 27, 2019) (the "Loan Agreement") with Hercules, under which the AGT, AHL and ASG (the "Borrowers") borrowed an aggregate of $55.0 million (the "Term Loan"). Subsequently, ASA was added as a Borrower in July 2017, ATH and ATI were added as Borrowers in April 2018 and the Company's affiliate, Roivant Sciences Ltd. ("RSL"), was added as a guarantor in November 2019. Pursuant to the Loan Agreement, ASI and RSL issued guarantees of the Borrowers’ obligations under the Loan Agreement and the Borrowers and ASI granted Hercules a first position lien on substantially all of their respective assets, excluding intellectual property. The Term Loan initially bore interest at a variable per annum rate calculated for any day as the greater of either (i) the prime rate plus 6.80%, and (ii) 10.55%, which was subsequently changed in connection with the November 2019 amendment of the Loan Agreement to a variable per annum rate calculated for any day as the greater of either (i) the prime rate plus 6.80%, and (ii) 11.55%. The Term Loan had a scheduled maturity date of March 1, 2021. The Borrowers were initially obligated to make monthly payments of accrued interest under the Loan Agreement until September 1, 2018, followed by monthly installments of principal and interest beginning October 1, 2018 through March 1, 2021. Subsequent to the November 2019 amendment of the Loan Agreement, the Borrowers were obligated to make monthly payments of accrued interest from December 1, 2019 until August 1, 2020, followed by monthly installments of principal and interest from September 1, 2020 through March 1, 2021. Prepayment of the Term Loan was subject to penalty. The Borrowers prepaid 50%, or approximately $15.7 million, of outstanding principal due without penalty in connection with the November 2019 amendment of the Loan Agreement, which was accounted for as a modification of debt in accordance with applicable accounting guidance. In April 2020, the Company prepaid $15.7 million of outstanding principal, together with $0.3 million of accrued interest, fees and other amounts, due under the Loan Agreement with Hercules. In connection with the prepayment, the credit facility and Loan Agreement with Hercules were terminated, and all obligations, liens and security interests under the Loan Agreement were released, discharged and satisfied (see Note 14).

In connection with the Loan Agreement, the Company issued a warrant to Hercules, exercisable for an aggregate of 34,260 of the Company’s common shares at an exercise price of $96.32 per share (the "Warrant"). In August 2017, Hercules exercised the Warrant on a cashless basis and received a net issuance of 16,228 of the Company's common shares. The Warrant was accounted for as an equity instrument since it was indexed to the Company’s common shares and met the criteria for classification in shareholders’ equity. The relative fair value of the Warrant on the date of issuance of approximately $2.3 million was estimated using the Black-Scholes model. In addition, at the closing of the Term Loan, the Company paid transaction costs of $1.5 million. These amounts were recorded as a discount on the debt and were amortized to interest expense using the effective interest method over the life of the Term Loan, which was a period of 48 months, with the remaining unamortized balance upon prepayment in April 2020 charged to interest expense.