Balance Sheet Components - Summary of Changes in Net Carrying Values of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 84,499	$ 84,282
Accumulated amortization	11,246	6,749
Net amount	$ 73,253	$ 77,533
Technology
Finite Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	10 years	10 years
Gross carrying amount	$ 77,700	$ 77,700
Accumulated amortization	6,799	2,914
Net amount	$ 70,901	$ 74,786
Licenses
Finite Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	10 years	10 years
Gross carrying amount	$ 185	$ 185
Accumulated amortization	169	165
Net amount	$ 16	$ 20
Patents And Websites
Finite Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	5 years	5 years
Gross carrying amount	$ 4,490	$ 4,274
Accumulated amortization	2,658	2,308
Net amount	$ 1,832	$ 1,966
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	4 years	4 years
Gross carrying amount	$ 1,347	$ 1,346
Accumulated amortization	1,067	897
Net amount	280	449
Commercials
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	777	777
Accumulated amortization	553	465
Net amount	$ 224	$ 312
Commercials | Minimum
Finite Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	2 years	2 years
Commercials | Maximum
Finite Lived Intangible Assets [Line Items]
Average estimated useful lives (in years)	3 years	3 years