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Weighted average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted(in shares) Weighted Average Number of Shares Outstanding, Diluted Increase in number of stock available for grant as a proportion of common stock outstanding (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Increase In Number Of Shares Available For Grant, Percentage Of Shares Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Increase In Number Of Shares Available For Grant, Percentage Of Shares Outstanding Deferred Revenue Geographical Information Revenue from Contract with Customer [Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Additional Paid-in Capital Additional Paid-in Capital [Member] Unvested shares of common stock subject to repurchase (in shares) Common Stock Subject To Repurchase, Nonvested, Number Of Shares Common Stock Subject To 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