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Balance Sheet Information - Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Deferred revenue, current	$ 21,631	$ 15,916
Accrued computer and networking equipment	2,274	3,126
Liability for early-exercised stock options	213	255
Other current liabilities	640	380
Total other current liabilities	$ 24,758	$ 19,677

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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