Warrants and rights classification.

No definition available.

Name:	astc_WarrantsAndRightsClassification
Namespace Prefix:	astc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrants and rights outstanding issue date.

+ References

No definition available.

+ Details

Name:	astc_WarrantsAndRightsOutstandingIssueDate
Namespace Prefix:	astc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementEquityComponentsAxis=astc_WarrantsIssuedOnMarchTwentySixTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=astc_WarrantsIssuedOnMarchThirtyTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity - Schedule of Warrants Outstanding (Details) - $ / shares	Mar. 30, 2020	Mar. 26, 2020	Jun. 30, 2020
Warrants issued on March 26, 2020
Class Of Stock [Line Items]
Issue Date		Mar. 26, 2020
Classification		Equity
Exercise price of warrants		$ 6.25
Expiration Date		Mar. 25, 2025
Number of Shares Underlying Warrants			24,780
Warrants issued on March 30, 2020
Class Of Stock [Line Items]
Issue Date	Mar. 30, 2020
Classification	Equity
Exercise price of warrants	$ 4.6875
Expiration Date	Mar. 27, 2025
Number of Shares Underlying Warrants			61,133
Warrants
Class Of Stock [Line Items]
Number of Shares Underlying Warrants			85,913