Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants - Additional Information (Detail)

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Stock Warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 14, 2021
Jan. 01, 2018
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2015
Common stock, Shares issued     188,482,934   188,482,934   185,993,058    
Warrants recognized liability at fair value         $ (1,669) $ 1,251      
Proceeds from Warrant Exercises         $ 0 455      
Warrant [Member]                  
Warrants And Rights Exercised and Expiry Date         Sep. 24, 2029        
Private Placement [Member] | Warrant [Member]                  
Warrants recognized liability at fair value $ 5,700       $ 1,000        
Private Placement [Member] | Warrant [Member] | Fair value of derivative liabilities                  
Warrants recognized liability at fair value     $ 1,000   $ 1,700        
Public Warrant [Member]                  
Warrants recognized in Shareholder equity Fair Value $ 9,700                
Loan Agreement [Member] | Right To Purchase Shares Of Common Stock [Member] | Warrant [Member]                  
Class of warrants and rights issued during period, Shares                 180,928
Class of warrants and rights, Exercise price of warrants and rights                 $ 0.06
Loan agreement termination date   Jan. 01, 2018              
Warrants and Rights Outstanding, Maturity Date     Feb. 17, 2025   Feb. 17, 2025        
Development Agreement [Member] | Right To Purchase Shares Series D Convertible Preferred Stock [Member] | Warrant [Member]                  
Class of warrants and rights issued during period, Shares               280,528  
Class of warrants and rights, Exercise price of warrants and rights               $ 0.0001  
Class of warrants of rights, Number of warrants or rights vested during period     71,138   91,175        
Class of warrants or rights non vested outstanding     19,036   19,036        
Increase or decrease derivative liabilities       $ 400   $ 500