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Organization and Significant Accounting Policies - Adoption of New Accounting Standards (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
ASSETS        
Accounts receivable, net $ 39,202   $ 45,700 $ 28,800
Deferred commissions 3,845   3,026 2,376
Deferred commissions, non-current 5,489   4,655 0
Liabilities        
Accrued expenses and other current liabilities 26,383   27,168 20,212
Deferred revenue 110,943   111,309 104,684
Deferred revenue, non-current 20,968   22,952 22,709
Accumulated deficit (266,574)   (256,956) (265,337)
Revenue        
Subscription and support 46,470 $ 39,540    
Professional services 13,436 12,364    
Operating expenses        
Sales and marketing 21,006 18,713    
Net loss $ (9,618) $ (5,836)    
Net loss per common share:        
Basic and diluted (in dollars per share) $ (0.22) $ (0.14)    
Balances Without Adoption of ASC 606        
ASSETS        
Accounts receivable, net $ 26,863     28,800
Deferred commissions 2,434     2,376
Deferred commissions, non-current 0     0
Liabilities        
Accrued expenses and other current liabilities 19,532     20,212
Deferred revenue 107,118     104,684
Deferred revenue, non-current 20,941     22,709
Accumulated deficit (275,110)     $ (265,337)
Revenue        
Subscription and support 46,237      
Professional services 15,130      
Operating expenses        
Sales and marketing 22,622      
Net loss $ (9,773)      
Net loss per common share:        
Basic and diluted (in dollars per share) $ (0.23)      
Accounting Standards Update 2014-09 | Effect of Change        
ASSETS        
Accounts receivable, net $ 12,339   16,900  
Deferred commissions 1,411   650  
Deferred commissions, non-current 5,489   4,655  
Liabilities        
Accrued expenses and other current liabilities 6,851   6,956  
Deferred revenue 3,825   6,625  
Deferred revenue, non-current 27   243  
Accumulated deficit 8,536   $ 8,381  
Revenue        
Subscription and support 233      
Professional services (1,694)      
Operating expenses        
Sales and marketing (1,616)      
Net loss $ 155      
Net loss per common share:        
Basic and diluted (in dollars per share) $ 0.01