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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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Net cash outflow or inflow from monetary allowance granted by the landlord to a tenant to entice tenant to move into landlords building which will enable the tenant to prepare the leased premises for tenants occupancy.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Commitments And Contingencies [Line Items]

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Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended			36 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Sep. 26, 2016	Apr. 30, 2015
Commitments And Contingencies [Line Items]
Restricted cash	$ 3,625,000	$ 3,610,000		$ 3,625,000
Lease rent expense	$ 4,900,000	5,600,000	$ 1,500,000
2016 Lexington, MA Lease [Member]
Commitments And Contingencies [Line Items]
Lease agreement term					10 years 9 months
Lease renewal term description	10 year and 9 month lease, which includes two successive five year renewal options
Restricted cash	$ 2,600,000	2,600,000		2,600,000
Lease extension period					5 years
Tenant improvement allowances received	8,500,000	2,800,000	$ 100,000	11,400,000
2015 Cambridge, MA Lease [Member]
Commitments And Contingencies [Line Items]
Lease agreement term						7 years 6 months
Restricted cash	$ 1,000,000	$ 1,000,000		$ 1,000,000
Lease extension period						5 years