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Balance Sheet Details - Schedule of Inventory and Other Deferred Costs (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory And Other Deferred Costs [Abstract]    
Raw materials $ 3,252 $ 1,424
Other deferred costs 3,272 3,182
Total inventory and other deferred costs $ 6,524 $ 4,606