Additional milestone payment.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Contract with customer liability milestone method revenue recognized.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Non-refundable upfront payments received.

+ References

No definition available.

+ Details

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- Definition

Revenue recognition expected period.

+ References

No definition available.

+ Details

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- Definition

Revenue recognition milestone method expected milestone receivable.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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-Publisher FASB
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-Topic 606
-SubTopic 10
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+ Details

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Balance Type:	credit
Period Type:	duration

- 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.

+ Details

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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+ Details

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- Details

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- Details

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Revenue - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended
Revenue - Additional Information (Details) - USD ($)	Mar. 31, 2021	Feb. 28, 2019	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenue recognized	$ 19,000,000.0		$ (21,351,000)
Revenue from collaboration agreement			38,442,000	$ 20,910,000
MRD Development Agreements
Disaggregation Of Revenue [Line Items]
Milestone revenue recognized			7,000,000.0
Revenue recognized			7,200,000	400,000
MRD Development Agreements \| Maximum
Disaggregation Of Revenue [Line Items]
Additional milestone payment receivable	306,500,000		306,500,000
Genentech Collaboration Agreement
Disaggregation Of Revenue [Line Items]
Non-refundable upfront payments received		$ 300,000,000.0	300,000,000.0
Revenue from collaboration agreement			$ 15,600,000	$ 10,900,000
Genentech Collaboration Agreement \| Maximum
Disaggregation Of Revenue [Line Items]
Revenue recognition expected period			8 years
Genentech Collaboration Agreement \| Maximum \| Regulatory Milestones
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	75,000,000.0		$ 75,000,000.0
Genentech Collaboration Agreement \| Maximum \| Development Milestones
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	300,000,000.0		300,000,000.0
Genentech Collaboration Agreement \| Maximum \| Commercial Milestones
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	1,430,000,000.0		1,430,000,000.0
Genentech Collaboration Agreement \| Minimum
Disaggregation Of Revenue [Line Items]
Expected revenue through milestone payments	$ 1,800,000		$ 1,800,000
Revenue recognition expected period			7 years