Financial Statement Components - Schedule of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 155,863	$ 77,976
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	77,209	73,100
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	41,038	2,179
U.S. treasury
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	21,499	0
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	0	2,697
Municipal bonds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	15,867	0
Corporate bonds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 250	$ 0