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Other Long-Term Assets - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred sales commission	$ 22,592
Deferred commissions, net of current portion	15,530	$ 12,200	$ 6,803
Accounting Standards Update 2014-09 \| Impact of Adoption of Topic 606 on Opening Balance Sheet
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred sales commission		7,300
Deferred commissions, net of current portion		$ 5,400
Customer B
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 600