Balance Sheet Components - Acquired Intangible Assets, Net (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,850,000		$ 250,000
Accumulated Amortization	950,000		219,000
Net Book Value	4,900,000		31,000
Acquired in-process research and development in process	5,600,000
Amortization of acquired intangible assets	700,000	$ 0
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,850,000		250,000
Accumulated Amortization	950,000		219,000
Net Book Value	$ 4,900,000		$ 31,000