Document and Entity Information - shares
6 Months Ended
Jun. 30, 2018
Oct. 31, 2018
Document and Entity Information [Abstract]    
Entity Registrant Name ELLIE MAE INC  
Entity Central Index Key 0001122388  
Document Type 10-Q/A  
Document Period End Date Jun. 30, 2018  
Amendment Flag true  
Amendment Description Restatement of unaudited condensed balance sheet as of June 30, 2018, and unaudited condensed statement of comprehensive income, its unaudited condensed statement of cash flows, and related footnote disclosures for the three and six months ended June 30, 2018. The Company has reassessed its application of certain aspects of Topic 606; and concluded that it did not adequately constrain the variable consideration included in the transaction price such that, at the time of adoption, it was probable that a significant revenue reversal would not occur. The Company also identified additional costs to obtain contracts that should have been recorded to its opening balances upon adoption of Topic 606.  
Entity Emerging Growth Company false  
Entity Small Business false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   34,841,403