Amount of interest expense on finance lease liability.

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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Balance Type:	na
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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
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- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

+ References

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- Definition

Lessee, Operating Lease, Monthly Contractual Payments

+ References

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- Definition

Lessee, Operating Leases, Tenant Improvement Allowance

+ References

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Leases - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
Leases - Narrative (Details) - USD ($) $ in Millions	Oct. 21, 2020	Mar. 31, 2021	Mar. 31, 2020
Lessee, Lease, Description [Line Items]
Short-term lease costs (less than)		$ 0.1	$ 0.1
Operating lease expense		1.9	1.4
Finance lease expense		0.1	$ 0.1
Leasehold improvements
Lessee, Lease, Description [Line Items]
Leasehold improvements recorded		$ 0.2
Cambridge, Massachusetts
Lessee, Lease, Description [Line Items]
Tenant improvement allowance	$ 4.3
Minimum \| Cambridge, Massachusetts
Lessee, Lease, Description [Line Items]
Contractual lease payments	0.4
Maximum \| Cambridge, Massachusetts
Lessee, Lease, Description [Line Items]
Contractual lease payments	$ 0.6