Balance Sheet Components (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventories    
Finished goods $ 14,061 $ 12,306
Component parts 1,251 209
Total inventories 15,312 12,515
Property and equipment, net    
Property and equipment, gross 13,278 11,246
Less: accumulated depreciation (9,335) (8,580)
Property and equipment, net 3,943 2,666
Computer equipment and software
   
Property and equipment, net    
Property and equipment, gross 4,152 3,518
Manufacturing tooling and test equipment
   
Property and equipment, net    
Property and equipment, gross 2,652 2,731
Furniture and fixtures
   
Property and equipment, net    
Property and equipment, gross 2,046 1,801
Lab and warehouse equipment
   
Property and equipment, net    
Property and equipment, gross 2,374 1,974
Marketing equipment
   
Property and equipment, net    
Property and equipment, gross 604 419
Leasehold improvements
   
Property and equipment, net    
Property and equipment, gross $ 1,450 $ 803