Summary of Significant Accounting Policies - Selected Unaudited Condensed Consolidated Balance Sheet Line Items (Details) - USD ($)
$ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Assets |
|
|
| Deferred commissions, current portion |
$ 10,440
|
$ 9,551
|
| Deferred commissions, net of current portion |
20,008
|
20,404
|
| Liabilities, Redeemable Convertible and Convertible Preferred Stock and Stockholders' Equity (Deficit) |
|
|
| Deferred revenue, current portion |
123,746
|
130,165
|
| Deferred revenue, net of current portion |
38,250
|
38,535
|
| Accumulated deficit |
$ (317,352)
|
(273,513)
|
| Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |
|
|
| Assets |
|
|
| Deferred commissions, current portion |
|
15,195
|
| Deferred commissions, net of current portion |
|
3,811
|
| Liabilities, Redeemable Convertible and Convertible Preferred Stock and Stockholders' Equity (Deficit) |
|
|
| Deferred revenue, current portion |
|
132,278
|
| Deferred revenue, net of current portion |
|
31,902
|
| Accumulated deficit |
|
(279,942)
|
| Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |
|
|
| Assets |
|
|
| Deferred commissions, current portion |
|
(5,644)
|
| Deferred commissions, net of current portion |
|
16,593
|
| Liabilities, Redeemable Convertible and Convertible Preferred Stock and Stockholders' Equity (Deficit) |
|
|
| Deferred revenue, current portion |
|
(2,113)
|
| Deferred revenue, net of current portion |
|
6,633
|
| Accumulated deficit |
|
$ 6,429
|