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Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options, share	2,164,870
Total unrecognized compensation cost, non-vested options	$ 16,200
Total unrecognized compensation cost non-vested options to be recognized, period	4 years
Share based compensation expense	$ 2,368	$ 1,513
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	$ 1.06	$ 7.00
Number of shares excluded from aggregate intrinsic value of options outstanding	4,779,271
Number of Shares excluded from Options Exercisable Aggregate Intrinsic Value	1,366,014
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	$ 1.61
Fair value of vested RSUs	$ 200
Total unrecognized compensation cost, non-vested options	$ 12,400
Total unrecognized compensation cost non-vested options to be recognized, period	3 years 10 months 24 days
2021 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for issuance	11,995,601
Maximum [Member] | 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum increase in annual amount number of common stock shares outstanding percentage	1.00%
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options, share	2,164,870	684,923	[1]
Common stock | 2021 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be issued in connection with stock option exercises under plan	100,000,000
Common stock | 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for issuance	4,573,602
Common stock | Maximum [Member] | 2021 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum increase in annual amount number of common stock shares outstanding percentage	5.00%
Common stock | Maximum [Member] | 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares granted	50,000,000
[1] Prior period results have been adjusted to reflect the exchange of Old Talkspace’s common stock for Talkspace’s common stock at an exchange ratio of approximately 1.134140 in June 2021 as a result of the Business Combination.

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