Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Additional Information (Details)

v3.20.4
Revenue Recognition - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Total deferred revenues $ 3,302 $ 3,281
Non-cancellable backlog $ 515  
Term of contract 12 months  
Accounts receivable, net of allowances $ 3,389 $ 5,208
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01    
Disaggregation of Revenue [Line Items]    
Remaining performance obligation, amount $ 1,496  
Remaining performance obligation, period 1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01    
Disaggregation of Revenue [Line Items]    
Remaining performance obligation, amount $ 908  
Remaining performance obligation, period 1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01    
Disaggregation of Revenue [Line Items]    
Remaining performance obligation, amount $ 898  
Remaining performance obligation, period  
Minimum    
Disaggregation of Revenue [Line Items]    
Payment terms 30 days  
Maximum    
Disaggregation of Revenue [Line Items]    
Payment terms 90 days