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Organization and Summary of Significant Accounting Policies - Related Parties (Details) - USD ($) $ in Millions		12 Months Ended
	Mar. 17, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
GSK
Related party transactions
Ordinary shares held (in percent)		16.90%
Number of shares purchased	1,301,015
Proceeds from sale of ordinary shares, net	$ 23.0
Member board of directors
Related party transactions
Fees incurred related to related party		$ 0.4	$ 0.5	$ 0.3
NDA Group
Related party transactions
Fees incurred related to related party		$ 0.0	$ 0.0	$ 0.1