Balance Sheet Components - Inventories, Net of Reserve (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 5,849	$ 6,876
Work-in-process	3,976	4,347
Finished goods	2,035	6,909
Total inventories	$ 11,860	$ 18,132

Inventory, Work In Process, Net of Reserves, Current And Noncurrent

No definition available.

Name:	vldr_InventoryWorkInProcessNetOfReservesCurrentAndNoncurrent
Namespace Prefix:	vldr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant