Post-effective amendment to a registration statement that is not immediately effective upon filing

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.21.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]        
Term of annual contract 1 year 1 year    
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] true true    
Deferred revenue recognized   $ 3,000 $ 2,200  
Deferred revenue $ 3,405 3,004 2,230  
Deferred cost of sales   500 300  
Commission expense   600 400  
Allowance for doubtful accounts   500 200  
Provision for uncollectible accounts $ 72 $ 377 $ 199  
Number of clients representing 10% or more of the company's total revenue | item   0 0  
Warranty reserve   $ 1,553 $ 1,491 $ 116
Sales and marketing expense        
Significant Accounting Policies [Line Items]        
Advertising Expense   40 100  
Accrued expenses and other current liabilities        
Significant Accounting Policies [Line Items]        
Warranty reserve   1,600 $ 1,500  
Restricted Cash        
Significant Accounting Policies [Line Items]        
Security deposit   $ 600