Trade Accounts Receivable and Financing Receivables - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable		$ 33,641,000		$ 25,144,000
Payment made by customer prior to the plan	$ 1,400,000
Revenue		$ 9,083,000	$ 10,459,000
Rental Equipment
Accounts Notes And Loans Receivable [Line Items]
Promissory notes receivable maximum interest rate		5.00%
Promissory notes receivable maturity month and year		2021-05
Term of sales-type lease		3 years
Future minimum lease payments		$ 2,100,000
Future minimum lease payments of unearned income		100,000
Interest income earned on lease		32,000	$ 100,000
Single Customer
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable		10,200,000
Unrecognized revenue		1,500,000
Single Customer | Customer Concentration Risk
Accounts Notes And Loans Receivable [Line Items]
Revenue		2,500,000
Single Customer | Trade Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable		$ 8,700,000		$ 8,500,000