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Share-Based Compensation - Summary of Stock Option Activity under 2014 Plan and 2021 Plan (Parenthetical) (Detail)	Jun. 22, 2021 $ / shares
Share-based Payment Arrangement, Disclosure [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_ShareBasedArrangementsToObtainGoodsAndServicesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration