Supplemental Financial Information - Earnings (loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net loss	$ (2,187)	$ (1,572)	$ (1,341)	$ (1,579)	$ (3,759)	$ (2,920)
Denominator:
Weighted average common shares used in basic computation (in shares)	40,493		33,242		37,397	33,221
Weighted average common shares used in diluted computation (in shares)	40,493		33,242		37,397	33,221
Net loss per share:
Basic (in dollars per share)	$ (0.05)		$ (0.04)		$ (0.10)	$ (0.09)
Diluted (in dollars per share)	$ (0.05)		$ (0.04)		$ (0.10)	$ (0.09)