Quarterly report pursuant to Section 13 or 15(d)

Business Segment Information - Schedule of Business Segment Information (Details)

v3.20.2
Business Segment Information - Schedule of Business Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Segment Reporting Information [Line Items]          
Net revenues $ 15,227 $ 21,003 $ 50,379 $ 64,861  
Operating income (loss) 31 1,351 696 3,263  
Identifiable assets 104,056   104,056   $ 126,477
Discontinued Operations          
Segment Reporting Information [Line Items]          
Identifiable assets         22,755
Operating Segments | Semiconductor          
Segment Reporting Information [Line Items]          
Net revenues 12,357 16,254 41,581 51,267  
Operating income (loss) 1,058 1,951 3,762 6,428  
Identifiable assets 55,374   55,374   56,855
Operating Segments | SiC/LED          
Segment Reporting Information [Line Items]          
Net revenues 2,870 3,074 8,155 9,330  
Operating income (loss) 241 607 1,196 2,253  
Identifiable assets 13,337   13,337   7,779
Non-Segment          
Segment Reporting Information [Line Items]          
Net revenues   1,675 643 4,264  
Operating income (loss) (1,268) $ (1,207) (4,262) $ (5,418)  
Identifiable assets $ 35,345   $ 35,345   $ 39,088