Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Accounts receivable, net:
Accounts receivable	$ 85,004	$ 60,062
Less allowance for doubtful accounts	940	968
Less reserve for future returns and pricing adjustments	2,967	2,677
Accounts receivable, net	81,097	56,417
Inventories:
Raw materials	17,149	12,308
Work in process	0	565
Finished goods	30,231	26,891
Inventories	$ 47,380	$ 39,764