Net Loss per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net loss	$ (1,394)	$ (2,160)	$ (2,238)	$ (2,855)	$ (3,137)	$ (3,006)	$ (5,792)	$ (8,998)
Denominator:
Denominator for basic and diluted net loss per share — weighted average common stock outstanding	5,467			4,060			4,734	4,059
Basic and diluted net loss per common share:
Net loss	$ (0.25)			$ (0.70)			$ (1.22)	$ (2.22)