Net Loss per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Amounts attributable to Astrotech Corporation, basic and diluted:
Net loss attributable to Astrotech Corporation	$ (13,251)	$ (11,582)
Denominator:
Basic and diluted (in shares)	4,061	4,084
Basic and diluted net loss per common share:
Net loss attributable to Astrotech Corporation (in dollars per share)	$ (3.26)	$ (2.84)