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Related Party Disclosures (Details) - USD ($) $ in Thousands		2 Months Ended	3 Months Ended	12 Months Ended
	Oct. 01, 2018	Nov. 23, 2018	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Payments to acquire additional interest in subsidiaries				$ 262	$ 0	$ 0
TxCell S.A.
Related Party Transaction [Line Items]
Number of ordinary shares acquired (in shares)	13,519,036	11,528,635
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement
Related Party Transaction [Line Items]
Number of ordinary shares acquired (in shares)				111,000	25,047,671
Payments to acquire additional interest in subsidiaries				$ 300
Former Executive of TxCell | TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement
Related Party Transaction [Line Items]
Number of ordinary shares acquired (in shares)			52,700
Payments to acquire additional interest in subsidiaries				$ 100

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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