Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) location	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) location	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of leased facilities \| location	2		2
Proceeds received from grant	$ 0.2	$ 0.5	$ 0.3	$ 0.9
Financial instrument, fair value	0.0		0.0		$ 0.0
Asset transfer, L1 to L2	0.0	0.0	0.0	0.0
Asset transfer, L2 to L1	0.0	0.0	0.0	0.0
Asset transfer, into L3			0.0	0.0
Asset transfer, out of L3			0.0	0.0
Liability transfer, L1 to L2	0.0	0.0	0.0	0.0
Liability transfer, L2 to L1	0.0	$ 0.0	0.0	0.0
Liability transfer, into L3			0.0	0.0
Liability transfer, out of L3			0.0	$ 0.0
Level 1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 2.3		$ 2.3		$ 2.3

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Proceeds From Government Assistance

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