Composition of Certain Financial Statement Captions - Summary of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 138,012	$ 33,079
Restricted cash and cash equivalents	2,307	1,443
Cash, cash equivalents, and restricted cash	$ 140,319	$ 34,522	$ 31,218	$ 42,589