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Balance Sheet Account Details - Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Other Balance Sheet Details [Abstract] |  |
Restricted cash | $ 2,616 | $ 0
Investment in Viking warrants | 9,257 | 0
Other | 8,545 | 1,514
Other current assets | $ 20,418 | $ 1,514

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