Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	2 Months Ended	12 Months Ended
Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($) bank shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Research and development expense \| $	$ 0	$ 43,500
Restricted Share Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted weighted-average common shares outstanding (in shares) \| shares		1,128,222
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted weighted-average common shares outstanding (in shares) \| shares		1,525,857
Research and development
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share-based compensation \| $	$ 0	$ 3,893
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Estimated useful lives of property and equipment		3 years
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Estimated useful lives of property and equipment		7 years
Credit Concentration Risk
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of banking institutions \| bank		2

Concentration Risk, Number of Banking Institutions in Which Funds are Deposited

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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