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Other Balance Sheet Details - Schedule of Intangible Assets and Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets (Excluding Goodwill)
Balance, beginning of year	$ 54,243	$ 0
Indefinite-lived assets - IPR&D	0	55,019
Foreign currency translation adjustment	(1,087)	(776)
Balance, end of year	53,156	54,243
Goodwill
Goodwill, beginning balance	40,044	1,585
Goodwill acquired	0	38,995
Foreign currency translation adjustment	(771)	(536)
Goodwill, ending balance	$ 39,273	$ 40,044

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Intangible Assets (Excluding Goodwill)

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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