Net Loss per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017
Amounts attributable to Astrotech Corporation, basic and diluted:
Loss before income taxes	$ (2,855)	$ (2,845)	$ (8,998)	$ (8,966)
Income tax benefit	0	(2)	0	(2)
Net loss	(2,855)	(2,847)	(8,998)	(8,968)	$ (11,600)
Less: Net loss attributable to noncontrolling interest	0	(47)	0	(150)
Net loss attributable to Astrotech Corporation	$ (2,855)	$ (2,800)	$ (8,998)	$ (8,818)
Denominator:
Denominator for basic and diluted net loss per share attributable to Astrotech Corporation — weighted average common stock outstanding	4,060	4,033	4,059	4,095
Basic and diluted net loss per common share:
Net loss attributable to Astrotech Corporation (in dollars per share)	$ (0.70)	$ (0.69)	$ (2.22)	$ (2.15)