Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details)

v3.21.2
SUBSEQUENT EVENTS (Details)
 1 Months Ended 9 Months Ended 12 Months Ended
Feb. 11, 2020
USD ($)
shares
Nov. 10, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Oct. 06, 2021
USD ($)
ft²
Aug. 14, 2020
USD ($)
Subsequent Event [Line Items]              
Number of shares issued (in shares) | shares 201,000            
Consideration received from sale of stock $ 28,800,000            
Gross proceeds from sale of common stock $ 26,400,000   $ 12,303,000 $ 28,750,000      
At-The-Market Equity Offering              
Subsequent Event [Line Items]              
Number of shares issued (in shares) | shares     3,068,370   4,609,701    
Share price (in dollars per share) | $ / shares     $ 4.01   $ 2.48    
Consideration received from sale of stock     $ 12,300,000   $ 11,400,000    
Gross proceeds from sale of common stock     11,900,000   $ 11,000,000    
Remaining authorized amount to be sold     $ 1,300,000       $ 25,000,000
Subsequent Event | Sublease Agreement | Sonim Technologies, Inc.              
Subsequent Event [Line Items]              
Area of property | ft²           8,416  
Initial, monthly rent           $ 12,500  
Renewal term           1 year  
Renewal, monthly rent           $ 13,250  
Subsequent Event | At-The-Market Equity Offering              
Subsequent Event [Line Items]              
Number of shares issued (in shares) | shares   2,524,200          
Share price (in dollars per share) | $ / shares   $ 2.50          
Consideration received from sale of stock   $ 6,300,000          
Gross proceeds from sale of common stock   6,100,000          
Remaining authorized amount to be sold   $ 45,000,000.0