Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Other Long-term Liabilities
Revenue Recognition
Long-term deferred revenue	$ 7,455

- Definition

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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