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ASC 606 Adoption Impact and Revenue from Contracts with Customers - ASC 606 Impact on Condensed Consolidated Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue $ 61,120 $ 47,727 $ 120,025 $ 94,741
Cost of revenue 24,814 20,273 49,516 40,244
Gross profit 36,306 27,454 70,509 54,497
Sales and marketing 17,912 16,932 35,390 32,710
Income (loss) from operations 194 (3,159) 44 (7,601)
Net loss $ (2,042) $ (4,007) $ (2,649) $ (9,262)
Basic and diluted net loss per share (in USD per share) $ (0.04) $ (0.07) $ (0.05) $ (0.17)
Balances without adoption of ASC 606        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue $ 60,772   $ 118,924  
Cost of revenue 24,668   49,125  
Gross profit 36,104   69,799  
Sales and marketing 19,588   38,728  
Income (loss) from operations (1,684)   (4,004)  
Net loss $ (3,920)   $ (6,697)  
Basic and diluted net loss per share (in USD per share) $ (0.07)   $ (0.12)  
Effect of Change Higher (Lower) | ASU 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue $ 348   $ 1,101  
Cost of revenue 146   391  
Gross profit 202   710  
Sales and marketing (1,676)   (3,338)  
Income (loss) from operations 1,878   4,048  
Net loss $ 1,878   $ 4,048  
Basic and diluted net loss per share (in USD per share) $ 0.03   $ 0.07