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Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items]
Number of operating segment \| Segment	1
Cash, cash equivalents and restricted cash	$ 178,444	$ 146,113	$ 153,894	$ 162,275
Restricted cash	$ 3,625	$ 3,610
Expected dividend rate	0.00%
Description of Income tax benefit, likelihood of realized upon ultimate settlement	The amount of the benefit that may be recognized is the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement.
Benefit related to remeasurement of deferred tax assets and liabilities as result of filing tax return	$ 200
Minimum [Member]
Significant Accounting Policies [Line Items]
Income tax examination, likelihood of settlement, percentage	50.00%
ASC 606 [Member]
Significant Accounting Policies [Line Items]
Revenue, practical expedient, incremental costs of obtaining contract	true
Accounting Standards Update No. 2016-16 [Member]
Significant Accounting Policies [Line Items]
Cumulative-effect adjustment to retained earnings	$ 400
Lexington, MA [Member]
Significant Accounting Policies [Line Items]
Restricted cash	2,600
Cambridge MA [Member]
Significant Accounting Policies [Line Items]
Restricted cash	$ 1,000