Summary of Significant Accounting Policies - Adoption of ASC 842 (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 14,566	$ 4,800
Total assets	126,241	114,362	$ 109,562
Operating lease liabilities	992	800
Total current liabilities	29,053	31,519	30,719
Operating lease liabilities - non-current	13,735	4,000
Total liabilities	52,092	37,616	32,816
Total liabilities and equity	126,241	114,362	$ 109,562
Restatement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		4,800
Total assets		4,800
Operating lease liabilities		800
Total current liabilities		800
Operating lease liabilities - non-current		4,000
Total liabilities		4,800
Total liabilities and equity		$ 4,800
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total assets	109,562
Total current liabilities	30,719
Total liabilities	32,816
Total liabilities and equity	$ 109,562