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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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Area of a real estate property.

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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

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984

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Present value of lessee's discounted obligation for lease payments from operating lease.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Amount of lessee's right to use underlying asset under operating lease.

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