Summary of Revenues Earned in Connection with EUSA Agreement under ASC 606 (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenues	$ 784	$ 1,611
Partnership Royalties
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenues	291	157
EUSA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaboration and Licensing Revenue	800	1,600
Revenues	784	1,611
ASC 606 \| EUSA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenues	784	1,611
ASC 606 \| EUSA \| Collaboration and Licensing Revenue
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenues	493	1,454
ASC 606 \| EUSA \| Partnership Royalties
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenues	$ 291	157
Upfront Payment \| ASC 606 \| EUSA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Date Achieved	2015-12
Collaboration and Licensing Revenue	$ 98	99
R&D Payment - EMA Approval in RCC \| ASC 606 \| EUSA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Date Achieved	2017-08
Collaboration and Licensing Revenue	$ 158	158
Milestone - UK Reimbursement Approval \| ASC 606 \| EUSA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Date Achieved	2018-02
Collaboration and Licensing Revenue	$ 79	79
Milestone - German Reimbursement Approval \| ASC 606 \| EUSA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Date Achieved	2018-11
Collaboration and Licensing Revenue	$ 79	79
Milestone - Spanish Reimbursement Approval \| ASC 606 \| EUSA
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Date Achieved	2019-02
Collaboration and Licensing Revenue	$ 79	$ 1,039

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+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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