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Common Stock Incentive, Stock Purchase Plans, and Other Compensation Plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | May 26, 2021 | Jun. 29, 2020 | Dec. 07, 2018 | Dec. 07, 2017 | Jun. 26, 2014 | Jun. 30, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable | $ 0 |  |  |  |  |  |  |
Aggregate intrinsic value of options | 0 |  |  |  |  |  |  |
Unrecognized compensation cost related to stock option and restricted awards | 1 |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense recognized | $ 1 | $ 147 |  |  |  |  |  |
Unrecognized compensation cost over a weighted-average period | 1 year 3 months 18 days |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense recognized | $ 625 | $ 202 |  |  |  |  |  |
Unrecognized compensation cost over a weighted-average period | 2 years 8 months 12 days |  |  |  |  |  |  |
Unrecognized compensation cost recognized | $ 3,700 |  |  |  |  |  |  |
2021 Omnibus Equity Plan | Common Stock |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares initially available for grant (in shares) |  |  | 1,500,000 |  |  |  |  |
Astrotech - The 2011 Stock Incentive Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock shares available for future issuance (in shares) |  |  |  | 1,500,000 | 537,197 | 225,000 | 400,000 | 350,000

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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