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CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Series G Redeemable Convertible Preferred Stock | Series D Redeemable Convertible Preferred Stock | Series E Redeemable Convertible Preferred Stock | Redeemable Convertible Preferred Stock | Redeemable Convertible Preferred Stock Series G Redeemable Convertible Preferred Stock | Redeemable Convertible Preferred Stock Series H Redeemable Convertible Preferred Stock | Redeemable Convertible Preferred Stock Series D Redeemable Convertible Preferred Stock | Redeemable Convertible Preferred Stock Series E Redeemable Convertible Preferred Stock | Common Stock | Additional Paid-In Capital | Additional Paid-In Capital Series G Redeemable Convertible Preferred Stock | Additional Paid-In Capital Series D Redeemable Convertible Preferred Stock | Additional Paid-In Capital Series E Redeemable Convertible Preferred Stock | Accumulated Other Comprehensive Gain (Loss) | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
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Balance at beginning of period (in shares) at Dec. 31, 2017 |  |  |  |  |  | 448,686,791 |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 |  |  |  |  |  | $ 1,176,661 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock, net of issuance costs (in shares) |  |  |  |  |  |  | 55,666,004 | 5,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock, net of issuance costs |  |  | $ 51 |  |  |  | $ 549,413 | $ 111,546 |  |  |  |  | $ 51 |  |  |  |  |
Repurchase of redeemable convertible preferred stock (in shares) |  |  |  |  |  |  |  |  | (269,180) | (544,100) |  |  |  |  |  |  |  |
Repurchase of redeemable convertible preferred stock |  |  |  | $ (2,009) | $ (2,118) |  |  |  | $ (704) | $ (3,355) |  |  |  | $ (2,009) | $ (2,118) |  |  |
Conversion of redeemable convertible preferred stock into common stock (in shares) |  |  |  |  |  | (508,539,515) |  |  |  |  | (236,012,913) |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock into common stock | $ 1,833,561 |  |  |  |  | $ (1,833,561) |  |  |  |  | $ 24 | $ 1,833,537 |  |  |  |  |  |
Balance at end of period (in shares) at Dec. 31, 2018 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2018 |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period (in shares) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  | 65,206,999 |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | (551,365) |  |  |  |  |  |  |  |  |  | $ 6 | 71,679 |  |  |  | $ (1,157) | $ (621,893) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 856,135 |  |  |  |  |  |  |
Exercise of options to purchase common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 446,864 |  |  |  |  |  |  |
Exercise of options to purchase common stock | 1,427 |  |  |  |  |  |  |  |  |  |  | 1,427 |  |  |  |  |  |
Conversion of redeemable convertible preferred stock into common stock (in shares) |  |  |  |  |  | 508,539,515 |  |  |  |  | 236,012,913 |  |  |  |  |  |  |
Conversion of redeemable convertible preferred stock into common stock | 1,833,561 |  |  |  |  | $ (1,833,561) |  |  |  |  | $ 24 | 1,833,537 |  |  |  |  |  |
Proceeds of initial public offering, net of issuance costs (in shares) |  |  |  |  |  |  |  |  |  |  | 26,275,993 |  |  |  |  |  |  |
Proceeds of initial public offering, net of issuance costs | 563,026 |  |  |  |  |  |  |  |  |  | $ 3 | 563,023 |  |  |  |  |  |
Stock-based compensation | 72,565 |  |  |  |  |  |  |  |  |  |  | 72,565 |  |  |  |  |  |
Other comprehensive income, net of tax | (163) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (163) |  |
Net loss | (384,734) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (384,734) |
Balance at end of period (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  | 328,798,904 |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2018 | $ 1,530,241 |  |  |  |  |  |  |  |  |  | $ 33 | 2,538,155 |  |  |  | (1,320) | (1,006,627) |
Balance at end of period (Accounting Standards Update 2014-09) at Dec. 31, 2018 |  | $ 27,984 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,984
Balance at end of period (Accounting Standards Update 2016-02) at Dec. 31, 2018 |  | $ (3,790) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,790)
Balance at end of period (in shares) at Dec. 31, 2019 | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2019 |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 621,432 |  |  |  |  |  |  |
Exercise of options to purchase common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 6,945,306 |  |  |  |  |  |  |
Exercise of options to purchase common stock | $ 47,259 |  |  |  |  |  |  |  |  |  | $ 1 | 47,258 |  |  |  |  |  |
Purchase of common stock under employee stock purchase plan (in shares) |  |  |  |  |  |  |  |  |  |  | 171,343 |  |  |  |  |  |  |
Purchase of common stock under employee stock purchase plan | 2,891 |  |  |  |  |  |  |  |  |  |  | 2,891 |  |  |  |  |  |
Stock-based compensation | 81,122 |  |  |  |  |  |  |  |  |  |  | 81,122 |  |  |  |  |  |
Other comprehensive income, net of tax | 3,124 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,124 |  |
Net loss | (514,021) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (514,021) |
Balance at end of period (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  | 336,536,985 |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2019 | $ 1,174,810 |  |  |  |  |  |  |  |  |  | $ 34 | 2,669,426 |  |  |  | 1,804 | (1,496,454) |
Balance at end of period (in shares) at Dec. 31, 2020 | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2020 |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 247,349 |  |  |  |  |  |  |
Exercise of options to purchase common stock (in shares) | 13,888,434 |  |  |  |  |  |  |  |  |  | 13,888,434 |  |  |  |  |  |  |
Exercise of options to purchase common stock | $ 179,643 |  |  |  |  |  |  |  |  |  | $ 1 | 179,642 |  |  |  |  |  |
Purchase of common stock under employee stock purchase plan (in shares) |  |  |  |  |  |  |  |  |  |  | 251,752 |  |  |  |  |  |  |
Purchase of common stock under employee stock purchase plan | 7,040 |  |  |  |  |  |  |  |  |  |  | 7,040 |  |  |  |  |  |
Proceeds of initial public offering, net of issuance costs (in shares) |  |  |  |  |  |  |  |  |  |  | 47,863,158 |  |  |  |  |  |  |
Proceeds of initial public offering, net of issuance costs | 1,852,725 |  |  |  |  |  |  |  |  |  | $ 5 | 1,852,720 |  |  |  |  |  |
Stock-based compensation | 93,021 |  |  |  |  |  |  |  |  |  |  | 93,021 |  |  |  |  |  |
Other comprehensive income, net of tax | 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200 |  |
Net loss | (747,064) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (747,064) |
Balance at end of period (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  | 398,787,678 |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2020 | $ 2,561,375 |  |  |  |  |  |  |  |  |  | $ 40 | $ 4,801,849 |  |  |  | $ 3,004 | $ (2,243,518) |

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