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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Segment
d
Reporting_Unit
Customer
$ / shares
Dec. 31, 2017
USD ($)
Customer
Dec. 31, 2016
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2015
USD ($)
Schedule Of Accounting Policies [Line Items]                            
Number of operating segment | Segment                   1        
Cash and cash equivalents, maturity description                   Three months or less at the date of purchase, consisting of money-market funds.        
Restricted cash related to letters of credit for leased facilities   $ 5,600,000       $ 5,100,000       $ 5,600,000 $ 5,100,000      
Impairment charges of long lived assets                   0        
Intangible assets with indefinite useful lives   0               $ 0        
Number of reporting unit | Reporting_Unit                   1        
Goodwill impairment $ 0                 $ 0 0 $ 0    
Advertising expense                   $ 8,400,000 5,500,000 4,200,000    
Revenue subscription contract period                   one year or less        
Additions in deferred revenue                   $ 46,300,000        
Additional Invoicing                   559,300,000        
Total revenues                   512,980,000 375,612,000 270,967,000    
Deferred revenue, revenue recognized                   138,100,000        
Revenue remaining performance obligation, contracts exceeds one year   126,400,000               $ 126,400,000        
Revenue remaining performance obligation contract period                   1 year        
Revenue remaining performance obligation percentage recognized                   94.00%        
Short-term deferred revenue   183,305,000       136,880,000       $ 183,305,000 136,880,000      
Increase in deferred commission expense                   22,900,000        
Incremental costs of deferred sales commission expense                   42,900,000        
Amortization of deferred commission expense                   20,000,000        
Off-balance sheet risk amount   0               $ 0        
Accounts receivable payment period                   30 days        
Capitalized software development costs, exclusive of costs recorded within property and equipment                   $ 12,800,000 8,200,000 6,400,000    
Amortization of software development costs, exclusive of costs recorded within property and equipment                   $ 9,200,000 6,300,000 5,100,000    
Minimum percentage chances of tax benefit to be realized on examination                   50.00%        
Net increase in cash and cash equivalents used in investing activities                   $ (71,230,000) (396,611,000) (22,829,000)    
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   (344,384,000)       (286,082,000)       $ (344,384,000) (286,082,000)      
Sales and marketing                   267,444,000 212,859,000 162,647,000    
Total operating expenses                   460,881,000 340,019,000 253,764,000    
Income tax (expense) benefit                   1,868,000 (10,325,000) 533,000    
Loss before income tax (expense) benefit                   (61,960,000) (50,039,000) (45,029,000)    
Net loss   (11,492,000) $ (18,663,000) $ (18,225,000) $ (15,448,000) (11,535,000) $ (10,583,000) $ (9,521,000) $ (8,075,000) (63,828,000) (39,714,000) (45,562,000)    
Comprehensive loss                   (64,494,000) (38,907,000) (45,621,000)    
Short-term deferred commissions   23,664,000       13,343,000       23,664,000 13,343,000      
Total current assets   712,418,000       602,501,000       712,418,000 602,501,000      
Long-term deferred commissions   2,179,000       2,277,000       2,179,000 2,277,000      
Total assets   833,953,000       712,175,000       833,953,000 712,175,000      
Total current liabilities   237,009,000       178,296,000       237,009,000 178,296,000      
Total liabilities   589,312,000       501,815,000       589,312,000 501,815,000      
Total stockholders' equity   244,641,000       210,360,000       244,641,000 210,360,000 118,700,000   $ 121,708,000
Total liabilities and stockholders' equity   833,953,000       712,175,000       833,953,000 712,175,000      
Deferred commissions expense                   (23,900,000) (4,004,000) (453,000)    
Increase in deferred revenue                   49,316,000 38,999,000 32,311,000    
Impact on cash flows from operations                   84,851,000 49,614,000 19,366,000    
Subscription [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Total revenues                   487,450,000 356,727,000 254,775,000    
Professional Services and Other [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Total revenues                   25,530,000 18,885,000 16,192,000    
Early Adoption Effect [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Net increase in cash and cash equivalents used in investing activities                   521,000 4,600,000 128,000    
Net increase in cash, cash equivalents and restricted cash                   521,000 $ 4,600,000 128,000    
Accounting Standards Update 2014-09 [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Adjustments to retained earnings       $ 274,000                    
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Total revenues                   (241,000)        
Short-term deferred revenue   (89,000)               (89,000)        
Cumulative adjustment to retained earnings   22,200,000               22,200,000     $ 5,500,000  
Sales and marketing                   (16,700,000)        
Total operating expenses                   (16,700,000)        
Income tax (expense) benefit                   (168,000)        
Loss before income tax (expense) benefit                   (16,500,000)        
Net loss                   (16,700,000)        
Comprehensive loss                   $ (16,700,000)        
Basic earnings (losses) per share | $ / shares                   $ (0.43)        
Short-term deferred commissions   4,100,000               $ 4,100,000        
Total current assets   4,100,000               4,100,000        
Long-term deferred commissions   18,100,000               18,100,000        
Other assets   (98,000)               (98,000)        
Total assets   22,100,000               22,100,000        
Total current liabilities   (89,000)               (89,000)        
Other liabilities   8,000               8,000        
Total liabilities   (81,000)               (81,000)        
Total stockholders' equity   22,200,000               22,200,000        
Total liabilities and stockholders' equity   22,100,000               22,100,000        
Deferred commissions expense                   16,700,000        
Increase in deferred revenue                   200,000        
Decrease in deferred taxes                   200,000        
Impact on cash flows from operations                   0        
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Subscription [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Total revenues                   (613,000)        
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Professional Services and Other [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Total revenues                   $ 372,000        
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Previously Reported                            
Schedule Of Accounting Policies [Line Items]                            
Cumulative adjustment to retained earnings                         $ 5,800,000  
Accounts Receivable [Member] | Customer Concentration Risk [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Number of customers represented more than 10% | Customer                   0 0      
Revenue [Member] | Customer Concentration Risk [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Number of customers represented more than 10% | Customer                   0 0      
Accrued Expenses and Other Current Liabilities [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Short-term deferred revenue   $ 1,600,000       $ 1,000,000       $ 1,600,000 $ 1,000,000      
Acquired Technology [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Estimated useful life             2 years              
Internal Use Software [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Property and equipment, estimated useful life                   5 years        
Stock-based compensation in capitalized software development costs                   $ 2,400,000 $ 1,600,000 $ 1,200,000    
Maximum [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Amortization period of deferred commissions                   3 years        
Maximum [Member] | Acquired Technology [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Estimated useful life                   3 years        
Maximum [Member] | Capitalized Software Development Costs [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Property and equipment, estimated useful life                   5 years        
Minimum [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Amortization period of deferred commissions                   1 year        
Minimum [Member] | Acquired Technology [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Estimated useful life                   2 years        
Minimum [Member] | Capitalized Software Development Costs [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Property and equipment, estimated useful life                   2 years        
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Common stock conversion price | $ / shares   $ 94.77               $ 94.77        
Debt instrument, convertible, threshold trading days | d                   20        
Debt instrument, convertible, threshold consecutive trading days | d                   30        
Percentage of closing price to trigger debt conversion                   130.00%        
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member] | Maximum [Member]                            
Schedule Of Accounting Policies [Line Items]                            
Common stock conversion price | $ / shares   $ 115.83               $ 115.83