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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