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Organization and Summary of Significant Accounting Policies - Impact of Adoption of ASC on Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
ASSETS |  |  |
Property and equipment, net | $ 29,926 |  | $ 78,723
Operating lease right-of-use assets | 77,289 |  | 0
Prepaid rent |  |  | 0
Liabilities: |  |  |
Operating lease liabilities - current | 3,214 | $ 1,408 | 0
Deferred rent |  |  | 271
Operating lease liabilities - long-term | 41,192 |  | 0
Accumulated deficit | $ (656,985) |  | (562,696)
Topic 842 |  |  |
ASSETS |  |  |
Property and equipment, net |  | 16,223 |
Operating lease right-of-use assets |  | 8,753 |
Prepaid rent |  | 36,025 |
Liabilities: |  |  |
Operating lease liabilities - current |  | 1,408 |
Deferred rent |  | 0 |
Operating lease liabilities - long-term |  | 7,933 |
Accumulated deficit |  | (561,799) |
Topic 842 | Adjustments Due to the Adoption of ASC Topic 842 |  |  |
ASSETS |  |  |
Property and equipment, net |  | (62,500) |
Operating lease right-of-use assets |  | 8,753 |
Prepaid rent |  | 36,025 |
Liabilities: |  |  |
Deferred rent |  | (271) |
Operating lease liabilities - long-term |  | 7,933 |
Accumulated deficit |  | 897 |
Build-to-Suit Leases |  |  |
Liabilities: |  |  |
Operating lease liabilities - long-term |  |  | $ 27,689
Build-to-Suit Leases | Topic 842 |  |  |
Liabilities: |  |  |
Operating lease liabilities - long-term |  | 0 |
Build-to-Suit Leases | Topic 842 | Adjustments Due to the Adoption of ASC Topic 842 |  |  |
Liabilities: |  |  |
Operating lease liabilities - long-term |  | $ (27,689) |

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