Stockholders' Equity (Details) - $ / shares	Mar. 31, 2020	Mar. 31, 2019	Jul. 24, 2018	Jul. 09, 2018
Stockholders' Equity
Shares authorized (in shares)	150,000,000	150,000,000		27,314,288
Par value (in dollars per share)	$ 0.001	$ 0.001
Initial public offering
Stockholders' Equity
Shares authorized (in shares)			150,000,000
Par value (in dollars per share)			$ 0.001
Undesignated preferred stock, authorized			10,000,000
Preferred stock, Par Value (in dollars per share)			$ 0.001
Common stock
Stockholders' Equity
Common stock reserved for the conversion of outstanding shares of preferred stock	10,449,033	6,873,744
Undesignated preferred stock | Initial public offering
Stockholders' Equity
Undesignated preferred stock, authorized	10,000,000
Preferred stock, Par Value (in dollars per share)	$ 0.001
Undesignated preferred shares issued	0
Undesignated preferred shares outstanding	0