Supplementary Financial Information - Earnings (loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Loss from continuing operations									$ (5,610)	$ (7,816)	$ (3,768)
Gain on sale of discontinued operation, net of tax											242
Net loss	$ 217	$ (2,068)	$ (2,187)	$ (1,572)	$ (2,432)	$ (2,464)	$ (1,341)	$ (1,579)	$ (5,610)	$ (7,816)	$ (3,526)
Denominator:
Weighted average common shares used in basic and diluted computation									39,012	33,266	32,776
Loss from continuing operations per share:
Basic (in dollars per share)									$ (0.14)	$ (0.23)	$ (0.12)
Diluted (in dollars per share)									$ (0.14)	$ (0.23)	$ (0.12)