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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands | Total | Redeemable Convertible Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ (1,979,438) |  |  | $ 55,568 | $ (2,033,995) | $ (1,011)
Beginning balance, shares at Dec. 31, 2017 |  | 199,815,000 |  |  |  |
Beginning balance at Dec. 31, 2017 |  | $ 4,284,049 |  |  |  |
Beginning balance, shares at Dec. 31, 2017 |  |  | 19,916,000 |  |  |
Issuance of Series H redeemable convertible preferred stock, net of issuance cost |  | $ 54,193 |  |  |  |
Issuance of Series H Redeemable Convertible Preferred Stock, net of issuance cost, shares |  | 1,364,000 |  |  |  |
Issuance of common stock upon exercise of stock options | 1,169 |  |  | 1,169 |  |
Issuance of common stock upon exercise of stock options, shares |  |  | 335,000 |  |  |
Vesting of early exercised stock options | 13 |  |  | 13 |  |
Stock-based compensation | 1,996 |  |  | 1,996 |  |
Other comprehensive income (loss) | (1,013) |  |  |  |  | (1,013)
Net loss | (234,339) |  |  |  | (234,339) |
Ending balance at Mar. 31, 2018 | (2,211,612) |  |  | 58,746 | (2,268,334) | (2,024)
Ending balance, shares at Mar. 31, 2018 |  | 201,179,000 |  |  |  |
Ending balance at Mar. 31, 2018 |  | $ 4,338,242 |  |  |  |
Ending balance, shares at Mar. 31, 2018 |  |  | 20,251,000 |  |  |
Beginning balance at Dec. 31, 2018 | (2,871,281) |  |  | 73,916 | (2,945,330) | 133
Beginning balance, shares at Dec. 31, 2018 |  | 219,175,709 |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 5,152,047 | $ 5,152,047 |  |  |  |
Beginning balance, shares at Dec. 31, 2018 | 22,438,472 |  | 22,438,000 |  |  |
Issuance of common stock upon exercise of stock options | $ 1,599 |  |  | 1,599 |  |
Issuance of common stock upon exercise of stock options, shares |  |  | 7,121,000 |  |  |
Issuance of common stock upon settlement of RSUs, shares |  |  | 17,688,000 |  |  |
Shares withheld related to net share settlement | (785,004) |  |  | (785,004) |  |
Shares withheld related to net share settlement, shares |  |  | (11,415,000) |  |  |
Vesting of early exercised stock options | 2 |  |  | 2 |  |
Stock-based compensation | 859,486 |  |  | 859,486 |  |
Other comprehensive income (loss) | 2,053 |  |  |  |  | 2,053
Net loss | (1,138,473) |  |  |  | (1,138,473) |
Ending balance at Mar. 31, 2019 | (3,931,618) |  |  | $ 149,999 | $ (4,083,803) | $ 2,186
Ending balance, shares at Mar. 31, 2019 |  | 219,175,709 |  |  |  |
Ending balance at Mar. 31, 2019 | $ 5,152,047 | $ 5,152,047 |  |  |  |
Ending balance, shares at Mar. 31, 2019 | 35,831,684 |  | 35,832,000 |  |  |

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