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Geographic Regions (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenue                 $ 85,035 $ 100,053 $ 83,073
Operating income (loss) $ 1,653 $ 1,351 $ 1,248 $ 664 $ (1,100) $ 2,826 $ 1,485 $ 2,861 4,916 6,072 3,641
Net long-lived assets 10,217       10,509       10,217 10,509  
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenue                 65,942 72,753 60,952
Operating income (loss)                 726 2,755 (51)
Net long-lived assets 9,893       10,039       9,893 10,039  
China                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenue                 9,500 17,634 12,673
Operating income (loss)                 3,686 5,445 3,647
Net long-lived assets 236       293       236 293  
France                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenue                 4,898 6,129 5,588
Operating income (loss)                 (786) (3,058) (1,000)
Net long-lived assets $ 88       $ 177       88 177  
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net revenue                 4,695 3,537 3,860
Operating income (loss)                 $ 1,290 $ 930 $ 1,045