Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued bonus	$ 8,652	$ 5,857
Vendor accruals	3,984	1,574
Accrued commissions	2,611	1,470
Contingent consideration, current	3,004	1,316
Accrued payroll and employee benefits	2,291	1,447
Employee contribution to ESPP	1,805	0
Accrued rebates	1,152	609
Accrued sales and use taxes	932	1,887
Accrued professional services	782	295
Accrued offering expenses	286	0
Other accrued expenses	2,302	1,697
Total	$ 27,801	$ 16,152