Accounts and Long Term Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 12,840		$ 12,840		$ 15,114
Long-term receivable	5,151		$ 5,151		$ 5,328
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term of accounts and long term receivables			1 year		1 year
Financing receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,900		$ 1,900		$ 2,100
Long term receivable - financing component	$ 4,900		$ 4,900		5,000
Long term receivables interest rate	6.90%		6.90%
Amount of allowance for credit losses or impairments with a contractual maturity of over one year	$ 0		$ 0
Accounts and long-term receivable past due	0		0		0
Activity in allowance for credit losses for accounts and long-term receivables	0	$ 0	$ 0	$ 0
Contract Receivable, Fiscal Year Maturity [Abstract]
2020 (remaining 6 months)					2,024
2021					2,258
2022					1,880
2023					1,423
Total payments					7,585
Less: unearned income					747
Total, net of unearned income					$ 6,838
Financing receivables | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturity term of accounts and long term receivables			1 year
Financing receivables | Other Income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts And Long Term Receivable, Interest Income	$ 114	$ 1	$ 230	$ 1