Balance Sheets Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Inventory write-down		$ 8,000	$ 321	$ 9,165
Sale of inventory	$ 3,000		2,500
Depreciation expense			3,300	3,500
Amortization expense for intangible assets			4,900	3,900
Intangibles Assets not amortized	$ 1,200		$ 2,000	$ 1,200