Summary of Significant Accounting Policies - Summary of Balance Sheet Items After Adoption of New Accounting Standards (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Liabilities and stockholders’ equity
Deferred revenue	$ 174,524	$ 123,276
Deferred revenue, noncurrent	1,213	1,257
Accumulated deficit	(430,586)	$ (319,720)
Pro Forma \| Accounting Standards Update 2014-09
Assets
Deferred costs	15,771
Deferred costs, noncurrent	15,395
Liabilities and stockholders’ equity
Deferred revenue	173,147
Deferred revenue, noncurrent	1,213
Accumulated deficit	$ (398,043)

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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