Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Narrative) (Details)

v3.21.2
Subsequent Events (Narrative) (Details)
12 Months Ended
Aug. 02, 2021
USD ($)
employee
item
shares
Dec. 31, 2020
USD ($)
shares
Aug. 01, 2021
shares
Jun. 30, 2021
shares
Subsequent Events [Line Items]        
Proceeds from sale   $ 8,900,000    
Number of options outstanding | shares   1,173,190   1,069,925
Subsequent Event [Member] | Lantronix [Member]        
Subsequent Events [Line Items]        
Number of former employees hired | employee 63      
Discontinued Operations, Disposed of by Sale [Member] | E&S Sale Transaction [Member]        
Subsequent Events [Line Items]        
Severance payments $ 1,250,000      
Discontinued Operations, Disposed of by Sale [Member] | E&S Sale Transaction [Member] | Subsequent Event [Member]        
Subsequent Events [Line Items]        
Proceeds from sale 24,160,000      
Sale price $ 25,027,566      
Earnout contingency, number of successive intervals required after closing | item 2      
Earnout contingency, successive interval period 180 days      
Number of employees terminated | employee 75      
Non-cash charge relating to acceleration and settlement of outstanding equity awards $ 325,000      
Discontinued Operations, Disposed of by Sale [Member] | E&S Sale Transaction [Member] | Maximum [Member] | Subsequent Event [Member]        
Subsequent Events [Line Items]        
Contingent earnout receivable $ 7,000,000.0      
Service agreement period 12 months      
2011 Executive Incentive Compensation Plan [Member]        
Subsequent Events [Line Items]        
Number of options outstanding | shares       1,168,630
2011 Executive Incentive Compensation Plan [Member] | Subsequent Event [Member]        
Subsequent Events [Line Items]        
Number of options outstanding | shares 0   995,530  
2011 Executive Incentive Compensation Plan [Member] | Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member]        
Subsequent Events [Line Items]        
Number of awards outstanding | shares 0   98,705