Share-Based Compensation	9 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation In June 2016, the Company adopted its 2016 Equity Incentive Plan, or as amended, the 2016 Plan, under which 4.5 million common shares were originally reserved for grant. On April 1, 2017, the number of common shares authorized for issuance increased automatically to 6.9 million in accordance with the 2016 Plan. At December 31, 2017, a total of 1.8 million common shares were available for future grant under the 2016 Plan. At December 31, 2017, there were 3.4 million options outstanding with a weighted average exercise price of $9.47 and 1.7 million restricted share awards and restricted stock units had been granted. (A) Stock Options, Restricted Share Awards and Restricted Stock Units Granted to Employees and Directors: During the nine months ended December 31, 2017 and 2016, the Company granted options to purchase a total of 2.2 million and 1.3 million common shares, respectively, to its employees and directors under the 2016 Plan. The Company recorded share-based compensation expense related to stock options issued to Company employees and directors of $2.1 million and $0.9 million, respectively, for the three months ended December 31, 2017 and 2016 and $4.9 million and $1.2 million, respectively, for the nine months ended December 31, 2017 and 2016. At December 31, 2017, total unrecognized compensation expense related to unvested options issued to employees and directors was $24.5 million, which is expected to be recognized over the remaining weighted-average service period of 3.08 years. During the nine months ended December 31, 2017 and 2016, the Company granted a restricted share award for 0.6 million and 1.1 million common shares, respectively, to the Company’s Principal Executive Officer under the 2016 Plan. The restricted share award granted during the nine months ended December 31, 2017 is a market-based award for which the grant date fair value was estimated using a Monte Carlo valuation model. The Company records expense ratably over the applicable vesting period regardless of whether the market condition is satisfied because the awards are subject to market conditions. During the nine months ended December 31, 2017, 15,000 restricted stock units were granted to employees. No restricted stock units were granted during the nine months ended December 31, 2016. The Company recorded total share-based compensation expense related to the restricted share awards and restricted stock units of $0.9 million and $0.4 million, respectively, for the three months ended December 31, 2017 and 2016 and $2.4 million and $0.8 million, respectively, for the nine months ended December 31, 2017 and 2016. At December 31, 2017, total unrecognized compensation expense related to unvested restricted share awards and restricted stock units was $10.3 million, which is expected to be recognized over the remaining weighted-average service period of 3.87 years. Share-based compensation expense is included in R&D and G&A expenses in the accompanying interim unaudited condensed consolidated statements of operations consistent with the grantee’s salary. (B) Share-Based Compensation for Related Parties: (1) Stock Options Granted to Non-Employees: The Company recorded share-based compensation expense related to stock options granted to consultants of $7,293 and $0.1 million, respectively, for the three months ended December 31, 2017 and 2016 and $0.2 million and $0.2 million, respectively, for the nine months ended December 31, 2017 and 2016. At December 31, 2017, total unrecognized compensation expense related to stock options granted to consultants was $0.1 million, which is expected to be recognized over 2.63 years. This share-based compensation expense is included in R&D and G&A expenses in the accompanying interim unaudited condensed consolidated statements of operations. During the nine months ended December 31, 2017, no options were granted to consultants under the 2016 Plan. During the nine months ended December 31, 2016, 0.1 million options were granted to consultants under the 2016 Plan. (2) Share-Based Compensation Allocated to the Company by RSL: Share-based compensation expense is allocated to the Company by RSL based upon the relative percentage of time utilized by RSL and RSI employees on Company matters. In relation to the RSL common share awards and options issued by RSL to RSL and RSI employees, the Company recorded share-based compensation expense of $0.2 million and $0.6 million, respectively, for the three months ended December 31, 2017 and 2016 and $0.7 million and $4.6 million, respectively, for the nine months ended December 31, 2017 and 2016. The RSL common share awards are valued at fair value on the date of grant and that fair value is recognized over the requisite service period. As RSL is a non-public entity, the RSL common share awards are classified as a level 3 financial instrument within the fair value hierarchy due to their unobservable nature. Significant judgment and estimates were used to estimate the fair value of these awards, as they are not publicly traded. RSL common share awards are subject to specified vesting schedules and requirements (a mix of time-based, performance-based and corporate event-based, including targets for RSL’s post-IPO market capitalization and future financing events). RSL estimated the fair value of each RSL option on the date of grant using the Black-Scholes closed-form option-pricing model. Share-based compensation expense has been and will continue to be allocated to the Company over the requisite service period over which these RSL common share awards and RSL options are expected to vest based upon the relative percentage of time utilized by RSL and RSI employees on Company matters.

Share-Based Compensation

In June 2016, the Company adopted its 2016 Equity Incentive Plan, or as amended, the 2016 Plan, under which 4.5 million common shares were originally reserved for grant. On April 1, 2017, the number of common shares authorized for issuance increased automatically to 6.9 million in accordance with the 2016 Plan.

At December 31, 2017, a total of 1.8 million common shares were available for future grant under the 2016 Plan. At December 31, 2017, there were 3.4 million options outstanding with a weighted average exercise price of $9.47 and 1.7 million restricted share awards and restricted stock units had been granted.

(A) Stock Options, Restricted Share Awards and Restricted Stock Units Granted to Employees and Directors:

During the nine months ended December 31, 2017 and 2016, the Company granted options to purchase a total of 2.2 million and 1.3 million common shares, respectively, to its employees and directors under the 2016 Plan. The Company recorded share-based compensation expense related to stock options issued to Company employees and directors of $2.1 million and $0.9 million, respectively, for the three months ended December 31, 2017 and 2016 and $4.9 million and $1.2 million, respectively, for the nine months ended December 31, 2017 and 2016. At December 31, 2017, total unrecognized compensation expense related to unvested options issued to employees and directors was $24.5 million, which is expected to be recognized over the remaining weighted-average service period of 3.08 years.

During the nine months ended December 31, 2017 and 2016, the Company granted a restricted share award for 0.6 million and 1.1 million common shares, respectively, to the Company’s Principal Executive Officer under the 2016 Plan. The restricted share award granted during the nine months ended December 31, 2017 is a market-based award for which the grant date fair value was estimated using a Monte Carlo valuation model. The Company records expense ratably over the applicable vesting period regardless of whether the market condition is satisfied because the awards are subject to market conditions. During the nine months ended December 31, 2017, 15,000 restricted stock units were granted to employees. No restricted stock units were granted during the nine months ended December 31, 2016. The Company recorded total share-based compensation expense related to the restricted share awards and restricted stock units of $0.9 million and $0.4 million, respectively, for the three months ended December 31, 2017 and 2016 and $2.4 million and $0.8 million, respectively, for the nine months ended December 31, 2017 and 2016. At December 31, 2017, total unrecognized compensation expense related to unvested restricted share awards and restricted stock units was $10.3 million, which is expected to be recognized over the remaining weighted-average service period of 3.87 years.

Share-based compensation expense is included in R&D and G&A expenses in the accompanying interim unaudited condensed consolidated statements of operations consistent with the grantee’s salary.

(B) Share-Based Compensation for Related Parties:

(1) Stock Options Granted to Non-Employees:

The Company recorded share-based compensation expense related to stock options granted to consultants of $7,293 and $0.1 million, respectively, for the three months ended December 31, 2017 and 2016 and $0.2 million and $0.2 million, respectively, for the nine months ended December 31, 2017 and 2016. At December 31, 2017, total unrecognized compensation expense related to stock options granted to consultants was $0.1 million, which is expected to be recognized over 2.63 years. This share-based compensation expense is included in R&D and G&A expenses in the accompanying interim unaudited condensed consolidated statements of operations. During the nine months ended December 31, 2017, no options were granted to consultants under the 2016 Plan. During the nine months ended December 31, 2016, 0.1 million options were granted to consultants under the 2016 Plan.

(2) Share-Based Compensation Allocated to the Company by RSL:

Share-based compensation expense is allocated to the Company by RSL based upon the relative percentage of time utilized by RSL and RSI employees on Company matters.

In relation to the RSL common share awards and options issued by RSL to RSL and RSI employees, the Company recorded share-based compensation expense of $0.2 million and $0.6 million, respectively, for the three months ended December 31, 2017 and 2016 and $0.7 million and $4.6 million, respectively, for the nine months ended December 31, 2017 and 2016.

The RSL common share awards are valued at fair value on the date of grant and that fair value is recognized over the requisite service period. As RSL is a non-public entity, the RSL common share awards are classified as a level 3 financial instrument within the fair value hierarchy due to their unobservable nature. Significant judgment and estimates were used to estimate the fair value of these awards, as they are not publicly traded. RSL common share awards are subject to specified vesting schedules and requirements (a mix of time-based, performance-based and corporate event-based, including targets for RSL’s post-IPO market capitalization and future financing events). RSL estimated the fair value of each RSL option on the date of grant using the Black-Scholes closed-form option-pricing model.

Share-based compensation expense has been and will continue to be allocated to the Company over the requisite service period over which these RSL common share awards and RSL options are expected to vest based upon the relative percentage of time utilized by RSL and RSI employees on Company matters.