The amount of guaranteed lease payments due annually under the lease agreement.

No definition available.

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- Definition

The amount of guaranteed lease payments due at the onset of the lease agreement.

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No definition available.

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The present value of guaranteed lease payments under the lease agreement.

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No definition available.

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- Definition

Required period of written notification prior to early termination required by terms of the finance lease agreement.

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No definition available.

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Amount of lessee's undiscounted obligation for lease payment for operating lease due after first fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

The number of dedicated rooms provided for gene therapy AADC program under terms of the agreement.

+ References

No definition available.

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- Definition

Number Of Operating Leases

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No definition available.

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- Definition

Number of renewable terms.

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No definition available.

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- Definition

Percent Of Market Rate

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No definition available.

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- Definition

Area of a real estate property.

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No definition available.

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- Definition

Amount of interest expense on finance lease liability.

+ References

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

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- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

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- Definition

Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

+ Details

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of operating lease expense. Excludes sublease income.

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- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Leases - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
Leases - Narrative (Details) $ in Thousands	Jun. 19, 2020 USD ($) room	Sep. 30, 2021 USD ($) ft² lease item	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) ft² lease item	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Leases
Number of operating leases \| lease		3		3
Operating lease, expense		$ 5,300	$ 5,200	$ 15,900	$ 10,200
Finance lease liabilities- current		2,557		2,557		$ 1,276
Finance lease liabilities- noncurrent		20,053		20,053		23,053
Aggregate rent, Initial term		133,641		133,641
2021 (excludes the nine months ended September 30, 2021)		3,417		3,417
2022		13,235		13,235
Finance Lease, Right-of-Use Asset		0		0
Research and development		130,845	92,998	390,840	359,630
MassBio
Leases
Finance lease cost		$ 400	$ 500	$ 1,300	$ 500
Written notice required for early lease termination	24 months
Number of dedicated rooms provided for gene therapy AADC program \| room	4
Guaranteed lease payment due at onset of the lease agreement	$ 15,000
Guaranteed lease payments due annually	3,000
Present value of guaranteed lease payments	$ 41,400
Finance lease, term of contract	12 years 6 months
Research and development						$ 41,400
Minimum
Leases
Operating lease, term of contract		3 months 18 days		3 months 18 days
Maximum
Leases
Operating lease, term of contract		13 years 9 months 18 days		13 years 9 months 18 days
Renewal Term		10 years		10 years
New Building \| Minimum
Leases
Area of real estate property \| ft²		75,000		75,000
Hopewell Campus
Leases
Operating lease, term of contract		15 years		15 years
Area of real estate property \| ft²		220,500		220,500
Renewal Term		10 years		10 years
Number of renewable terms \| item		2		2
Aggregate rent, Initial term		$ 111,500		$ 111,500
Percent of market rate		95.00%		95.00%
Mountainview
Leases
2021 (excludes the nine months ended September 30, 2021)		$ 500		$ 500
2022		1,400		1,400
Thereafter		$ 0		$ 0