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Subsequent Events	6 Months Ended
Subsequent Events	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 1, 2017, the Company entered into a lease amendment (the “Amendment”) with 188 Spear Street LLC, the landlord of the building which is located at 188 Spear Street, San Francisco, California, to renew early and extend the term of its current operating lease through July 2027. Under the Amendment, beginning November 1, 2017 the Company will pay monthly base rent, with aggregate annual amounts escalating over the term of the lease from approximately $480,000 to approximately $620,000. The landlord has agreed to provide the Company with a construction allowance of approximately $2.6 million.