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ASC 606 Adoption Impact and Revenue from Contracts with Customers - ASC 606 Impact on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 20,167	$ 19,151	$ 19,048
Prepaid expenses and other current assets	8,437		4,840
Deferred contract acquisition costs	26,476	23,138
Deferred revenue	14,750	$ 13,568	13,975
Accumulated deficit	(153,925)		$ (175,421)
Balances without adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	20,064
Prepaid expenses and other current assets	8,075
Deferred contract acquisition costs	0
Deferred revenue	16,002
Accumulated deficit	(182,118)
Effect of Change Higher (Lower) | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	103
Prepaid expenses and other current assets	362
Deferred contract acquisition costs	26,476
Deferred revenue	(1,252)
Accumulated deficit	$ 28,193

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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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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