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Revenues - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Unsatisfied performance obligations for contracts, disclosure description The Company does not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.      
Cumulative adjustment to retained earnings $ (295,737,000)     $ (286,082,000)
Subscription revenue 108,602,000 $ 77,503,000    
Professional services and other revenue 5,954,000 4,749,000    
Selling and marketing expense 59,910,000 46,672,000    
Total operating expenses 103,503,000 73,180,000    
Loss from operations (11,324,000) (8,000,000)    
Loss before income tax (expense) benefit (14,957,000) (7,877,000)    
Net loss (15,448,000) (8,075,000)    
Comprehensive loss (15,529,000) (7,919,000)    
Short-term deferred commissions 12,721,000     13,343,000
Total current assets 619,543,000     602,501,000
Total assets 742,975,000     712,175,000
Short-term deferred revenue 148,500,000     136,880,000
Total current liabilities 192,370,000     178,296,000
Total liabilities 521,877,000     501,815,000
Total stockholders’ equity 221,098,000     210,360,000
Total liabilities and stockholders’ equity 742,975,000     712,175,000
Deferred commissions expense (5,068,000) (464,000)    
Deferred revenue net 10,973,000 8,453,000    
Impact on cash flows from operations $ 26,722,000 $ 19,092,000    
Revenue subscription contract period One year or less      
Increase in deferred revenue $ 11,600,000      
Additional Invoicing 126,200,000      
Deferred revenue, revenue recognized 114,600,000      
Deferred revenue       $ 71,600,000
Revenue remaining performance obligation, contracts exceeds one year $ 74,300,000      
Revenue remaining performance obligation contract period 1 year      
Revenue remaining performance obligation percentage recognized 90.00%      
Revenu remaining performance obligations recognized period 24 months      
Increase in deferred commission expense $ 4,800,000      
Incremental costs of deferred sales commission expense 9,400,000      
Amortization of deferred commission expense $ 4,600,000      
Minimum [Member]        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Amortization period of deferred commissions 2 years      
Maximum [Member]        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Amortization period of deferred commissions 3 years      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative adjustment to retained earnings $ 9,300,000   $ 5,800,000  
Subscription revenue (170,000)      
Professional services and other revenue 140,000      
Total revenues (30,000)      
Selling and marketing expense (3,600,000)      
Total operating expenses (3,600,000)      
Loss from operations (3,500,000)      
Loss before income tax (expense) benefit (3,500,000)      
Net loss (3,500,000)      
Comprehensive loss $ (3,500,000)      
Basic earnings (losses) per share $ (0.09)      
Short-term deferred commissions $ (2,200,000)      
Total current assets (2,200,000)      
Long-term deferred commissions 11,200,000      
Total assets 9,000,000      
Short-term deferred revenue (300,000)      
Total current liabilities (300,000)      
Total liabilities (300,000)      
Total stockholders’ equity 9,300,000      
Total liabilities and stockholders’ equity 9,000,000      
Deferred commissions expense 3,600,000      
Deferred revenue net (30,000)      
Impact on cash flows from operations $ 0