Borrowing Arrangements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Mar. 15, 2021
Jun. 30, 2021
Dec. 31, 2021
May 31, 2021
Credit And Security Agreement [Member]        
Line Of Credit Facility [Line Items]        
Debt Issuance Costs, Net     $ 0.2  
Debt Instrument, Fee Amount     0.1  
Fees Related To Issuance Of Warrant     $ 0.1  
Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Amount Borrowed       $ 6.0
Amount Repaid   $ 6.0    
Credit Agreement [Member] | JPMorgan Chase Bank NA [Member]        
Line Of Credit Facility [Line Items]        
Class of warrant or right, number of securities called by warrants or rights 114,454      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.01      
Old Talkspace [Member] | Credit And Security Agreement [Member] | Term Loan [Member]        
Line Of Credit Facility [Line Items]        
Debt Instrument, Face Amount $ 15.0      
Old Talkspace [Member] | Credit And Security Agreement [Member] | JPMorgan Chase Bank NA [Member] | Term Loan [Member]        
Line Of Credit Facility [Line Items]        
Debt Instrument, Drawn Period 12 months      
Debt Instrument, Payment Terms The term loan will be required to be repaid within thirty-six months, beginning twelve months from the effective date of the Credit Agreement.      
Old Talkspace [Member] | Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 5.0