License agreement payment upon achievement of specified product sales or development and commercialization milestones.

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Partial upfront consideration payment under license agreement.

+ References

No definition available.

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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.

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Cost of maintenance incurred and directly related to good produced and service rendered.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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License and Sponsored Research Agreements - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development expenses		$ 7,877,000	$ 3,489,000	$ 14,283,000	$ 7,623,000
Yale
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Partial upfront consideration payment under license agreement				60,000
Milestone payment upon achievement of certain milestones		3,000,000		3,000,000
Yale \| Sponsored Research Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research support funding amount	$ 2,400,000
Research support funding period	5 years
Research support funding expiration year	2021
Research and development expenses		100,000	200,000	200,000	200,000
Yale \| Other Arrangements
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Research and development expenses		$ 0	$ 300,000	0	$ 300,000
Yale \| License
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Maintenance fees				$ 60,000