XML 59 R27.htm IDEA: XBRL DOCUMENT v3.24.0.1

Common Stock (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Reserved Shares of Common Stock for Future Issuance

The Company has reserved the following shares of common stock for future issuance, on an as-converted basis, as follows:

		December 31,
		2023				2022
Shares issuable upon the exercise of outstanding    common stock options and the vesting of    outstanding common restricted stock    units granted			7,130,956				4,269,861
Shares available for future grant under the 2020    Equity Incentive Plan			3,158,094				4,253,854
Shares available for future grant under the    Employee Stock Purchase Plan			1,128,732				916,640
Total			11,417,782				9,440,355

X

- Definition

Schedule of reserved shares of common stock for future issuance.

+ References

No definition available.

+ Details

Name:	atha_ScheduleOfReservedSharesOfCommonStockForFutureIssuanceTableTextBlock
Namespace Prefix:	atha_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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