Commitments and Contingencies - Schedule of Other Information related to Stamford Lease (Detail) - Stamford Operating Lease [Member] - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Other Commitments [Line Items]
Operating cash outflows relating to operating lease	$ 306	$ 300
ROU assets obtained in exchange for new operating lease liabilities		$ 3,636
Remaining lease term-operating lease (years)	3 years 8 months 12 days	4 years 8 months 12 days
Discount rate - operating lease	7.00%	7.00%

Discount rate used by lessee to determine present value of operating lease payments.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
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-Section 45
-Paragraph 5
-Subparagraph (c)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
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