Income Taxes - Components of current and deferred federal and state income tax (benefits) provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Components of income tax (benefit) expense
Loss from continuing operations before income taxes	$ (7,780)	$ (5,586)	$ (5,231)
Current income tax provision:
Federal		3	71
State	36	45	62
Total current tax provision	36	48	133
Deferred income tax provision (benefit):
Federal		(1,849)	(166)
State		(17)	(11)
Total deferred tax (benefit) provision		(1,866)	(177)
Provision (benefit) for income taxes on continuing operations	36	(1,818)	(44)
Loss from continuing operations	$ (7,816)	$ (3,768)	$ (5,187)