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Balance Sheet Components - Allowance for Doubtful Accounts and Reserve for Subscriber Refunds (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at the beginning of the year | $ 315 | $ 295 | $ 384
Additions — charged to costs and expenses, or contra revenue, net | 482 | 158 | 107
Deductions — recoveries of amounts previously charged-off | (104) | (125) | (89)
Deductions — write-offs | (1) | (13) | (107)
Balance at end of year | 692 | 315 | 295
Reserve for member refunds |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at the beginning of the year | 530 | 474 | 530
Additions — charged to costs and expenses, or contra revenue, net | 688 | 942 | 507
Deductions — recoveries of amounts previously charged-off | 0 | 0 | 0
Deductions — write-offs | (839) | (886) | (563)
Balance at end of year | $ 379 | $ 530 | $ 474

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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