Quarterly report pursuant to Section 13 or 15(d)

Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details)

v3.20.4
Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 100.00% 100.00%
United States    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 19.00% 33.00%
Other North America    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 1.00% 9.00%
Total North America    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 20.00% 42.00%
China    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 24.00% 23.00%
Malaysia    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 3.00% 2.00%
Taiwan    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 32.00% 13.00%
Other Asia    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 9.00% 6.00%
Total Asia    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 68.00% 44.00%
Germany    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 2.00% 3.00%
Other Europe    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 10.00% 11.00%
Total Europe    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 12.00% 14.00%