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Business Combination - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Jun. 22, 2021
Mar. 31, 2021
 [1]
Dec. 31, 2020
 [1]
Business Acquisition [Line Items]          
Common stock, par value $ 0.0001 $ 0.0001      
Preferred stock, par value $ 0.0001        
Conversion of stock, conversion rate     $ 1.134140    
Common stock, shares authorized 1,000,000,000 1,000,000,000      
Preferred stock, shares authorized 100,000,000        
Common stock, shares outstanding 155,104,655 152,862,447      
Warrant liabilities $ 3,195 $ 4,070      
Common stock          
Business Acquisition [Line Items]          
Common stock, shares outstanding 155,104,655 152,862,447   14,098,354 13,413,431
[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.