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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Variable Interest Entity [Line Items] |  |  |  |
Interest income | $ 15,900 | $ 8,100 | $ 42,800 | $ 20,200
Unrealized gain (loss) | (5,066) | (115) | 24,181 | 126,444
Net foreign currency exchange gains |  | 800 |  | 2,900
Realized loss |  |  | (8,200) |
Mark-to-market charge |  |  | 1,300 |
Realized gain | (8) | $ 702 | 2,136 | 27,874
Pinterest |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Unrealized reduction to estimated fair value of warrant | 8,700 |  |  |
Unrealized gain (loss) | $ 4,600 |  | 25,300 | 128,800
Realized gain |  |  |  | $ 26,800
Warrant |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Unrealized gain (loss) |  |  | $ (8,700) |

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