XML 55 R43.htm IDEA: XBRL DOCUMENT
v3.21.1

Business Risk and Credit Risk Concentration Involving Cash - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Customer | Mar. 31, 2020 Customer | Mar. 31, 2021 USD ($) Customer | Mar. 31, 2020 Customer
Risks And Uncertainties [Abstract] |  |  |  |
Revenue from number of customers | Customer | 2 | 1 | 2 | 1
Federal Deposit Insurance Corporation amount per depositor | $ | $ 250 |  | $ 250 |

X
- Definition Revenue from contract with customers, number of customers. + References No definition available. + Details
Name: | astc_RevenueFromContractWithCustomersNumberOfCustomers
Namespace Prefix: | astc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashFDICInsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration