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Organization and Summary of Significant Accounting Policies - Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (18,664) | $ (12,843) | $ (16,640) | $ (20,187) | $ (13,091) | $ (12,354) | $ (12,491) | $ (16,632) | $ (68,334) | $ (54,568) | $ (71,658)
Changes in deferred revenue |  |  |  |  |  |  |  |  | 99,364 | $ 48,984 | $ (5,214)
Adjustments [Member] | Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | (13,558) |  |
Changes in deferred revenue |  |  |  |  |  |  |  |  | 13,558 |  |
Balances without adoption of Topic 606 [Member] | Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | (81,892) |  |
Changes in deferred revenue |  |  |  |  |  |  |  |  | $ 112,922 |  |

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