Shareholders' Equity	12 Months Ended
Mar. 31, 2020
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity (A) Overview: The Company’s Memorandum of Association, filed on October 31, 2014 in Bermuda, authorized the issuance of one class of shares. The total number of shares authorized was 1,000,000,000 with a par value per share of $0.00001 at March 31, 2020. A 1-for-8 reverse share split of the Company's outstanding common stock was effected on May 8, 2019 as approved by the Company's Board of Directors and a majority of its shareholders, which reduced the number of common shares issued and outstanding from approximately 182.2 million to 22.8 million as of March 31, 2019. As such, all references to share and per share amounts in the financial statements and accompanying notes to the financial statements have been retroactively restated to reflect the 1-for-8 reverse share split, except for the authorized number of shares of the Company's common stock and the par value per share, which were not affected. (B) Transactions: For the years ended March 31, 2020 and March 31, 2019, RSI incurred $0.1 million and $1.9 million, respectively, of expenses on behalf of the Company. These amounts were treated as capital contributions. On June 5, 2018, the Company entered into a share purchase agreement with RSL pursuant to which the Company agreed to issue and sell to RSL 1,785,714 of its common shares at a purchase price of $14.00 per share, which was the closing price per share of the Company's common shares on the Nasdaq Global Select Market on June 5, 2018. On July 9, 2018, the Company received $25.0 million of net proceeds from RSL upon the closing of this private placement (see Note 8 (C)). On June 22, 2018, the Company entered into a sales agreement with Cowen and Company, LLC ("Cowen") to sell the Company's common shares having an aggregate offering price of up to $75.0 million from time to time through an at-the-market equity offering program under which Cowen has acted as the Company's agent, which was terminated in April 2020. As of March 31, 2020, approximately $0.1 million of the Company's common shares had been sold under the sales agreement. On December 18, 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 8(C) for information regarding RSL's participation in this offering. In March 2019, the Company issued and sold 3,333,333 common shares, including 833,333 shares issued and sold to RSL, at an offering price of $12.00 per common share for gross proceeds of $40.0 million. The aggregate net proceeds to the Company were approximately $37.9 million, after deducting underwriting discounts and commissions and offering expenses incurred. 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 8(C)). The pre-funded warrants do not expire and are immediately exercisable except that the pre-funded warrants cannot be exercised by the holder if, after giving effect thereto, the holder would beneficially own more than 9.99% of the Company’s common stock, subject to certain exceptions. The pre-funded warrants are classified as equity in accordance with ASC 480, "Distinguishing Liabilities from Equity", and the fair value of the pre-funded warrants was recorded as a credit to additional paid-in capital and is not subject to remeasurement. As of March 31, 2020, none of the pre-funded warrants had been exercised. In April 2020, the Company entered into a sales agreement with SVB Leerink LLC to sell the Company's common shares having an aggregate offering price of up to $25.0 million from time to time through an at-the-market equity offering program under which SVB Leerink LLC is acting as the Company's agent. SVB Leerink LLC is entitled to compensation for its services in an amount equal to 3% of the gross proceeds of any of the Company's common shares sold under the sales agreement. The Company has sold approximately 0.9 million common shares for total proceeds of approximately $2.7 million, net of brokerage fees, under the sales agreement since April 2020 (see Note 14).

Shareholders’ Equity

(A) Overview:

The Company’s Memorandum of Association, filed on October 31, 2014 in Bermuda, authorized the issuance of one class of shares. The total number of shares authorized was 1,000,000,000 with a par value per share of $0.00001 at March 31, 2020. A 1-for-8 reverse share split of the Company's outstanding common stock was effected on May 8, 2019 as approved by the Company's Board of Directors and a majority of its shareholders, which reduced the number of common shares issued and outstanding from approximately 182.2 million to 22.8 million as of March 31, 2019. As such, all references to share and per share amounts in the financial statements and accompanying notes to the financial statements have been retroactively restated to reflect the 1-for-8 reverse share split, except for the authorized number of shares of the Company's common stock and the par value per share, which were not affected.

(B) Transactions:

For the years ended March 31, 2020 and March 31, 2019, RSI incurred $0.1 million and $1.9 million, respectively, of expenses on behalf of the Company. These amounts were treated as capital contributions.

On June 5, 2018, the Company entered into a share purchase agreement with RSL pursuant to which the Company agreed to issue and sell to RSL 1,785,714 of its common shares at a purchase price of $14.00 per share, which was the closing price per share of the Company's common shares on the Nasdaq Global Select Market on June 5, 2018. On July 9, 2018, the Company received $25.0 million of net proceeds from RSL upon the closing of this private placement (see Note 8 (C)).

On June 22, 2018, the Company entered into a sales agreement with Cowen and Company, LLC ("Cowen") to sell the Company's common shares having an aggregate offering price of up to $75.0 million from time to time through an at-the-market equity offering program under which Cowen has acted as the Company's agent, which was terminated in April 2020. As of March 31, 2020, approximately $0.1 million of the Company's common shares had been sold under the sales agreement.

On December 18, 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 8(C) for information regarding RSL's participation in this offering.

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

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 8(C)). The pre-funded warrants do not expire and are immediately exercisable except that the pre-funded warrants cannot be exercised by the holder if, after giving effect thereto, the holder would beneficially own more than 9.99% of the Company’s common stock, subject to certain exceptions. The pre-funded warrants are classified as equity in accordance with ASC 480, "Distinguishing Liabilities from Equity", and the fair value of the pre-funded warrants was recorded as a credit to additional paid-in capital and is not subject to remeasurement. As of March 31, 2020, none of the pre-funded warrants had been exercised.

In April 2020, the Company entered into a sales agreement with SVB Leerink LLC to sell the Company's common shares having an aggregate offering price of up to $25.0 million from time to time through an at-the-market equity offering program under which SVB Leerink LLC is acting as the Company's agent. SVB Leerink LLC is entitled to compensation for its services in an amount equal to 3% of the gross proceeds of any of the Company's common shares sold under the sales agreement. The Company has sold approximately 0.9 million common shares for total proceeds of approximately $2.7 million, net of brokerage fees, under the sales agreement since April 2020 (see Note 14).