Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Class of Stock [Line Items]
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Secured financing	$ 15,913	$ 0
Common Class A
Class of Stock [Line Items]
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	29,824,686	27,367,477
Common stock, shares outstanding (in shares)	29,824,686	27,367,477
Common Class B
Class of Stock [Line Items]
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	22,049,727	23,516,439
Common stock, shares outstanding (in shares)	22,049,727	23,516,439