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Revenue Recognition - Summary of Impact of ASC 606 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Service revenue $ 81,346   $ 159,467    
Product revenue 4,336   9,440    
Total revenue 85,682 $ 72,483 168,907 $ 141,581  
Operating expenses:          
Sales and marketing 55,930 41,163 109,235 82,273  
Loss from operations (21,987) (4,462) (37,970) (9,919)  
Net loss $ (21,482) $ (546) $ (36,837) $ (2,715)  
Net loss per share:          
Basic and diluted $ (0.23) $ (0.01) $ (0.39) $ (0.03)  
Current assets:          
Deferred sales commission costs $ 13,656   $ 13,656   $ 11,234
Other current assets 13,889   13,889   11,765
Non-current assets:          
Deferred sales commission costs 29,229   29,229   26,942
Stockholders' equity:          
Accumulated deficit (198,400)   (198,400)   (161,563)
Cash Flow Line Items          
Net loss (21,482) $ (546) (36,837) $ (2,715)  
Deferred sales commission costs     (4,675) 0  
Other current and noncurrent assets     (1,452)    
Net cash provided by operating activities     (4,550) $ 11,174  
ASC 605 | Previous          
Service revenue 81,543   159,785    
Product revenue 4,176   9,187    
Total revenue 85,719   168,972    
Operating expenses:          
Sales and marketing 58,806   113,910    
Loss from operations (24,826)   (42,580)    
Net loss $ (24,321)   $ (41,447)    
Net loss per share:          
Basic and diluted $ (0.26)   $ (0.44)    
Current assets:          
Deferred sales commission costs         0
Other current assets         10,040
Non-current assets:          
Deferred sales commission costs         0
Stockholders' equity:          
Accumulated deficit         (201,464)
Cash Flow Line Items          
Net loss $ (24,321)   $ (41,447)    
Deferred sales commission costs     0    
Other current and noncurrent assets     (1,517)    
Net cash provided by operating activities     (4,550)    
ASC 606 | Adjustment          
Service revenue (197)   (318)    
Product revenue 160   253    
Total revenue (37)   (65)    
Operating expenses:          
Sales and marketing (2,876)   (4,675)    
Loss from operations 2,839   4,610    
Net loss $ 2,839   $ 4,610    
Net loss per share:          
Basic and diluted $ 0.03   $ 0.05    
Current assets:          
Deferred sales commission costs $ 13,656   $ 13,656   11,234
Other current assets 1,782   1,782   1,725
Non-current assets:          
Deferred sales commission costs 29,229   29,229   26,942
Stockholders' equity:          
Accumulated deficit 44,667   44,667   $ 39,901
Cash Flow Line Items          
Net loss 2,839   4,610    
Deferred sales commission costs     (4,675)    
Other current and noncurrent assets     65    
Net cash provided by operating activities     0    
ASC 605 | Previous          
Current assets:          
Deferred sales commission costs 0   0    
Other current assets 12,017   12,017    
Non-current assets:          
Deferred sales commission costs 0   0    
Stockholders' equity:          
Accumulated deficit $ (243,067)   $ (243,067)