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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 |  |  |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 + Details
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- Definition Description of the likelihood that an uncertainty in income taxes will not be sustained as a result of the examination by the taxing authority. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 15 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65877542&loc=d3e27249-109313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 305 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84242212&loc=d3e2352-115587 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 + Details
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