Annual report pursuant to Section 13 and 15(d)

Stock-based compensation. (Details) - Schedule of stock-based compensation expense

v3.21.1
Stock-based compensation. (Details) - Schedule of stock-based compensation expense - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation expense $ 2,679 $ 2,809
Employees [Member]    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation expense 2,025 2,422
Non-Employees [Member]    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation expense $ 654 $ 387