Risks and Uncertainties - Additional Information (Details) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Concentration Risk [Line Items]
Number of customers affiliated with common parent | Customer						3
Revenue	$ 22,703	$ 25,907	$ 17,705	$ 22,873	$ 43,612	$ 66,315	$ 66,871
Trade accounts receivables	13,685					13,685		$ 24,193
Sales Revenue | Customer Concentration Risk | Three Customers Affiliated with Common Parent
Concentration Risk [Line Items]
Revenue						34,900
Accounts Receivable | Credit Concentration Risk | Three Customers Affiliated with Common Parent
Concentration Risk [Line Items]
Trade accounts receivables	$ 10,400					$ 10,400