Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

SUBSEQUENT EVENT (Detail)

v3.21.2
SUBSEQUENT EVENT (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 23, 2019
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jul. 02, 2021
Dec. 31, 2020
Statement Line Items [Line Items]            
Shares issued   110,927,690 110,927,690     83,184,843
Proceeds from issuance shares     $ 2,524 $ 22,749    
Aspire Capital Fund Llc [Member]            
Statement Line Items [Line Items]            
Shares issued   1,400,000 1,400,000   200,000  
Proceeds from issuance shares $ 329 $ 2,524