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Revenues (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue from Contract with Customer [Abstract] |  |  |
Contract with Customer, Refund Liability |  | $ 1,500 |
Allowance for Doubtful Accounts Receivable, Current | $ 4,932 |  | $ 9,909
allowance for fallouts and billing adjustments |  |  | $ 3,100

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- Definition allowance for fallouts and billing adjustments + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130609-203046-203046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130607-203046-203046 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL51751984-203043 + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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