Leases (Details) $ in Thousands	1 Months Ended	9 Months Ended
	Jul. 31, 2021 USD ($) ft²	Sep. 30, 2021 USD ($) ft² building	Sep. 30, 2020 USD ($)
Leases
Area of leased space | ft²		170,000
Number of building leased | building		2
Area of lease space terminated | ft²		8,000
Decrease in operating lease assets	$ 1,100
Decrease in operating lease liabilities	$ 3,000	$ (443)	$ (2,021)
Gain on lease modification		$ 1,863
Area of subleased property | ft²	21,000
Monthly base rent	$ 100
Increase in annual base rent (as a percent)	3.00%