Subsequent Events - Additional Information (Details) - Subsequent Event $ in Millions	Feb. 06, 2020 USD ($)	Jan. 08, 2020 USD ($) Employee
Merck License and Research Agreement
Subsequent Event [Line Items]
Payments received under collaboration agreement	$ 10.0
Restructuring
Subsequent Event [Line Items]
Percentage of employees to be terminated		59.00%
Number of employees to be terminated \| Employee		51
Expected aggregate charges		$ 6.1
One time severance and employee termination related costs		2.0
One time retention costs		3.8
Relocation costs		$ 0.3

Estimated one time retention costs.

No definition available.

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- Definition

Estimated one time severance and employee termination related costs.

+ References

No definition available.

+ Details

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- Definition

Estimated relocation costs.

+ References

No definition available.

+ Details

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- Definition

Cash received from collaborators during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585

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- Definition

Amount expected to be recognized in earnings for the specified restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

+ References

No definition available.

+ Details

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- Definition

The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

+ References

No definition available.

+ Details

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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