Net Loss per Share - Basic and Diluted Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Amounts attributable to Astrotech Corporation, basic and diluted:
Loss before income taxes	$ (3,006)	$ (3,467)
Income tax benefit	0	0
Net loss	(3,006)	(3,467)
Less: Net loss attributable to noncontrolling interest	0	(52)
Net loss attributable to Astrotech Corporation	$ (3,006)	$ (3,415)	$ 11,600
Denominator:
Denominator for basic and diluted net loss per share attributable to Astrotech Corporation — weighted average common stock outstanding (in shares)	4,057,066	4,126,071
Basic and diluted net loss per common share:
Net loss attributable to Astrotech Corporation (in dollars per share)	$ (0.74)	$ (0.83)