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
Jul. 14, 2021
Jan. 01, 2018
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2015
Common stock, Shares issued     187,117,960   185,993,058    
Warrants recognized liability at fair value     $ (693) $ 1,010      
Proceeds from Warrant Exercises     $ 100      
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   $ 2,000        
Private Placement [Member] | Warrant [Member] | Fair value of derivative liabilities              
Warrants recognized liability at fair value     $ 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        
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       20,037      
Class of warrants or rights non vested outstanding       90,173      
Increase or decrease derivative liabilities       $ 100