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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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