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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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