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Net Income (Loss) Per Share - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Parenthetical) (Detail)	Jun. 22, 2021 $ / shares
Earnings Per Share [Abstract]
Conversion of stock, conversion rate	$ 1.134140

X

- Definition

The exchange rate per share of the conversion feature embedded in the business combination.

+ References

No definition available.

+ Details

Name:	talk_ConversionOfStockConversionRate
Namespace Prefix:	talk_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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