Balance Sheet Details - Deferred Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current	$ 14,676	$ 12,247	$ 13,076
Deferred revenue, noncurrent	20,712		20,645
Deferred revenue	35,388		33,721
Products and services
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current	10,675		9,125
Deferred revenue, noncurrent	493		18
Extended warranty
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current	4,001		3,951
Deferred revenue, noncurrent	$ 20,219		$ 20,627

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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