Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3.a.u2
Business Segment Information - Schedule of Business Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Segment Reporting Information [Line Items]      
Net revenues $ 20,692 $ 23,225  
Operating income (loss) 1,637 664  
Identifiable assets 122,285   $ 126,477
Discontinued Operations      
Segment Reporting Information [Line Items]      
Identifiable assets 18,752   22,755
Operating Segments | Semiconductor      
Segment Reporting Information [Line Items]      
Net revenues 17,232 18,960  
Operating income (loss) 2,722 2,745  
Identifiable assets 56,055   56,855
Operating Segments | SiC/LED      
Segment Reporting Information [Line Items]      
Net revenues 2,817 2,983  
Operating income (loss) 534 769  
Identifiable assets 7,499   7,779
Non-Segment      
Segment Reporting Information [Line Items]      
Net revenues 643 1,282  
Operating income (loss) (1,619) $ (2,850)  
Identifiable assets $ 39,979   $ 39,088