License Agreements - CAR-T Products License (Details) - License And Development Agreement With TDT	1 Months Ended	12 Months Ended
Jun. 30, 2018 USD ($) Milestone	Dec. 31, 2018 USD ($)
CAR-T products and CAR-T Diagnostics
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payment of license agreement fees		$ 5,000,000
Annual maintenance fees	$ 500,000
Unpaid annual maintenance fees, short term debt interest rate (%)	1.50%
Number of developmental and regulatory milestone payments for first product development \| Milestone	4
Maximum aggregate milestone commitment fund for first product development	$ 15,000,000
Number of developmental and regulatory milestone payments for each additional product development \| Milestone	4
Maximum milestone commitment fund for each additional product development	$ 7,500,000
CAR-T products and CAR-T Diagnostics \| Net sales of period from first commercial sale until patent expires \| Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of royalty fees (%)	10.00%
CAR-T products and CAR-T Diagnostics \| Net sales of period from first commercial sale until patent expires \| Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of royalty fees (%)	15.00%
CAR-T products and CAR-T Diagnostics \| 10 years from first commercial sale of products
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of years from first commercial sale of products (in years)	10 years
CAR-T products and CAR-T Diagnostics \| 10 years from first commercial sale of products \| Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of royalty fees (%)	5.00%
CAR-T products and CAR-T Diagnostics \| 10 years from first commercial sale of products \| Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage of royalty fees (%)	9.00%
Phase II and Phase III clinical trials of CAR-T Product \| Prior to the completion of the Phase I and Phase II clinical trials for the CAR-T product
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Amount of fund obligated to advance for each phase	$ 20,000,000

Amount of maximum aggregate milestone commitment fund for first product development.

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Amount of maximum milestone commitment fund for each additional product development.

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Amount of license milestone commitment fund obligated to pay for each phase.

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Number of milestone developmental and regulatory milestone payments for each additional product development.

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Number of milestone developmental and regulatory milestone payments for first product development.

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Number of years from the first commercial sale of CAR-T product or CAR-T Diagnostic.

+ References

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Percentage of royalty fees

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Amount of upfront payment of license agreement fee.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
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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
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2))
-Publisher FASB
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