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Summary of Significant Accounting Policies - Leases (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) ft² | Jan. 01, 2019 USD ($)
Recent Accounting Pronouncements |  |
Operating lease right-of-use asset | $ 15,704 |
Operating lease liability | $ 16,596 |
Practical Expedients, Package | true |
Practical Expedient, Use of Hindsight | false |
Finance Lease deferred leasing inventives costs | $ 12,600 |
Waltham Massachusetts Facility |  |
Recent Accounting Pronouncements |  |
Area of leased space | ft² | 27,000 |
Burlington Massachusetts Facility |  |
Recent Accounting Pronouncements |  |
Area of leased space | ft² | 19,000 |
ASU No 2016-02 Leases | Adjustment |  |
Recent Accounting Pronouncements |  |
Operating lease right-of-use asset |  | $ 12,800
Operating lease liability |  | $ 13,400

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- Definition Indicates (true false) whether practical expedient is elected to use hindsight in determining lease term and in assessing impairment of right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984 + Details
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