Fair Value Measurements - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Dec. 31, 2018	Mar. 31, 2018
Carrying Value
ASSETS
Cash and cash equivalents	[1]	$ 30,054	$ 28,845
Restricted cash and cash equivalents		7,389	2,373
Total		37,443	31,218
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value
ASSETS
Cash and cash equivalents	[1]	30,054	28,845
Restricted cash and cash equivalents		7,389	2,373
Total		37,443	31,218
Significant Other Observable Inputs (Level 2) | Fair Value
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Total		0	0
Unobservable Inputs (Level 3) | Fair Value
ASSETS
Cash and cash equivalents	[1]	0	0
Restricted cash and cash equivalents		0	0
Total		$ 0	$ 0

[1] Cash equivalents consist primarily of money market funds.