Annual report pursuant to Section 13 and 15(d)

Balance Sheet Components - Components of Balance Sheet Accounts (Details)

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Balance Sheet Components - Components of Balance Sheet Accounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property and equipment:    
Office equipment $ 517 $ 495
Office software 672 536
Machinery 28 24
Furniture and fixtures 241 222
Leasehold improvements 840 730
Construction in progress 157 10
Property and equipment, at cost 2,455 2,017
Accumulated depreciation and amortization (1,067) (1,123)
Property and equipment, net 1,388 894
Other accrued expenses:    
Sales returns 1,632 1,552
Employee-related expense 10,541 11,064
Warehousing, inventory-related and other 2,816 4,087
Other accrued expenses 14,989 16,703
Deferred revenue:    
Deferred revenue 4,948 4,011
Unshipped product    
Deferred revenue:    
Deferred revenue 2,191 1,783
Auto ship advances    
Deferred revenue:    
Deferred revenue 2,327 1,597
Enrollment package revenue    
Deferred revenue:    
Deferred revenue 430 331
Market development fees    
Deferred revenue:    
Deferred revenue $ 0 $ 300