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CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Conversion of Class B Common Stock To Class A Common Stock | Common Stock | Additional paid-in capital | Accumulated deficit | Accumulated other comprehensive income (loss) | Redeemable convertible preferred stock | Class A common stock | Class A common stock Common Stock | Class A common stock Common Stock Conversion of Class B Common Stock To Class A Common Stock | Class B common stock | Class B common stock Common Stock | Class B common stock Common Stock Conversion of Class B Common Stock To Class A Common Stock
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Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | 165,658,000 |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 |  |  |  |  |  |  | $ 331,521 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | 165,658,000 |  |  |  |  |  |
Ending balance at Jun. 30, 2019 |  |  |  |  |  |  | $ 331,521 |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 91,542,000 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ (113,505) |  | $ 85 | $ 82,345 | $ (195,878) | $ (57) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with acquisition (in shares) |  |  | 7,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with acquisition | 18 |  |  | 18 |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (in shares) |  |  | 581,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options | 1,067 |  | $ 1 | 1,066 |  |  |  |  |  |  |  |  |
Repurchases of unvested common stock (in shares) |  |  | (40,000) |  |  |  |  |  |  |  |  |  |
Issuance of common stock related to early exercised stock options (in shares) |  |  | 596,000 |  |  |  |  |  |  |  |  |  |
Vesting of shares issued upon early exercise of stock options | 1,438 |  |  | 1,438 |  |  |  |  |  |  |  |  |
Stock-based compensation | 2,244 |  |  | 2,244 |  |  |  |  |  |  |  |  |
Net loss | (36,820) |  | $ (36,820) |  | (36,820) |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 123 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  | 92,686,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | (145,435) |  | $ 86 | 87,111 | (232,698) | 66 |  |  |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | 165,658,000 |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 |  |  |  |  |  |  | $ 331,521 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (in shares) |  |  |  |  |  |  | 0 |  |  |  |  |  |
Issuance of common stock in connection with acquisition |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | 165,658,000 |  |  |  |  |  |
Ending balance at Jun. 30, 2019 |  |  |  |  |  |  | $ 331,521 |  |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2019 |  |  | 92,293,000 |  |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | (128,224) |  | $ 85 | 84,668 | (212,992) | 15 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (in shares) |  |  | 235,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options | 386 |  | $ 1 | 385 |  |  |  |  |  |  |  |  |
Repurchases of unvested common stock (in shares) |  |  |  |  |  |  |  |  | (31,000) |  |  |  |
Issuance of common stock related to early exercised stock options (in shares) |  |  | 189,000 |  |  |  |  |  |  |  |  |  |
Vesting of shares issued upon early exercise of stock options | 942 |  |  | 942 |  |  |  |  |  |  |  |  |
Stock-based compensation | 1,116 |  |  | 1,116 |  |  |  |  |  |  |  |  |
Net loss | (19,706) |  | $ (19,706) |  | (19,706) |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 51 |  |  |  |  | 51 |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  | 92,686,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | (145,435) |  | $ 86 | 87,111 | (232,698) | 66 |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 0 |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  | 0 |  |  |  |  |  |
Ending balance at Jun. 30, 2020 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  | 87,071,783 | 87,072,000 |  | 213,101,364 | 213,101,000 |
Beginning balance at Dec. 31, 2019 | $ 725,828 |  |  | 1,027,179 | (301,706) | 61 |  |  | $ 87 |  |  | $ 207 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with acquisition (in shares) | 948,000 |  |  |  |  |  |  |  | 107,000 |  |  |  |
Issuance of common stock in connection with acquisition | $ 1,821 |  |  | 1,821 |  |  |  |  |  |  |  |  |
Issuance of unvested restricted stock in connection with acquisition (in shares) |  |  |  |  |  |  |  |  | 841,000 |  |  |  |
Issuance of common stock upon exercise of stock options (in shares) | 2,618,000 |  |  |  |  |  |  |  |  |  |  | 2,582,000 |
Issuance of common stock upon exercise of stock options | $ 4,335 |  |  | 4,333 |  |  |  |  |  |  |  | $ 2 |
Repurchases of unvested common stock (in shares) |  |  |  |  |  |  |  |  | (37,000) |  |  |  |
Issuance of common stock related to early exercised stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  | 36,000 |
Vesting of shares issued upon early exercise of stock options | 2,511 |  |  | 2,509 |  |  |  |  |  |  |  | $ 2 |
Issuance of common stock related to settlement of RSUs (in shares) |  |  |  |  |  |  |  |  | 82,000 |  |  | 1,645,000 |
Issuance of common stock related to settlement of RSUs | 1 |  |  | (1) |  |  |  |  |  |  |  | $ 2 |
Tax withholding on RSU settlement (in shares) |  |  |  |  |  |  |  |  | (11,000) |  |  | (402,000) |
Tax withholding on RSU settlement | (7,308) |  |  | (7,308) |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A common stock (in shares) |  |  |  |  |  |  |  |  |  | 96,438,000 |  |  | 96,438,000
Conversion of Class B to Class A common stock |  | $ 0 |  |  |  |  |  |  |  | $ 97 |  |  | $ (97)
Equity component of convertible senior notes, net of issuance costs | 200,812 |  |  | 200,812 |  |  |  |  |  |  |  |  |
Purchases of capped calls related to convertible senior notes | (67,333) |  |  | (67,333) |  |  |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) |  |  |  |  |  |  |  |  | 421,000 |  |  |  |
Common stock issued under employee stock purchase plan | 5,447 |  |  | 5,447 |  |  |  |  |  |  |  |  |
Tax withholding on common stock issued under employee stock purchase plan (in shares) |  |  |  |  |  |  |  |  | (13,000) |  |  |  |
Tax withholding on common stock issued under employee stock purchase plan | (376) |  |  | (376) |  |  |  |  |  |  |  |  |
Stock-based compensation | 27,042 |  |  | 27,042 |  |  |  |  |  |  |  |  |
Net loss | (58,881) |  |  |  | (58,881) |  |  |  | $ (26,404) |  |  | $ (32,477) |
Other comprehensive income (loss) | 1,163 |  |  |  |  | 1,163 |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 184,900,249 | 184,900,000 |  | 120,523,936 | 120,524,000 |
Ending balance at Jun. 30, 2020 | 835,618 |  |  | 1,194,125 | (360,031) | 1,224 |  |  | $ 184 |  |  | $ 116 |
Beginning balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | 0 |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  | 0 |  |  |  |  |  |
Ending balance at Jun. 30, 2020 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 154,622,000 |  |  | 148,735,000 |
Beginning balance at Mar. 31, 2020 | 706,352 |  |  | 1,038,544 | (333,896) | 1,407 |  |  | $ 154 |  |  | $ 143 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with acquisition | 717 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (in shares) |  |  |  |  |  |  |  |  | 0 |  |  | 1,079,000 |
Issuance of common stock upon exercise of stock options | 1,660 |  |  | 1,659 |  |  |  |  | $ 0 |  |  | $ 1 |
Repurchases of unvested common stock (in shares) |  |  |  |  |  |  |  |  |  | (8,000) |  |  |
Issuance of common stock related to early exercised stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  | 21,000 |
Vesting of shares issued upon early exercise of stock options | 1,288 |  |  | 1,287 |  |  |  |  |  |  |  | $ 1 |
Issuance of common stock related to settlement of RSUs (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  | 522,000 |
Issuance of common stock related to settlement of RSUs | 1 |  |  | 0 |  |  |  |  |  |  |  | $ 1 |
Tax withholding on RSU settlement (in shares) |  |  |  |  |  |  |  |  | 0 |  |  | (5,000) |
Tax withholding on RSU settlement | (193) |  |  | (193) |  |  |  |  |  |  |  |  |
Conversion of Class B to Class A common stock (in shares) |  |  |  |  |  |  |  |  |  | 29,828,000 |  |  | 29,828,000
Conversion of Class B to Class A common stock |  | $ 0 |  |  |  |  |  |  |  | $ 30 |  |  | $ (30)
Equity component of convertible senior notes, net of issuance costs | 200,812 |  |  | 200,812 |  |  |  |  |  |  |  |  |
Purchases of capped calls related to convertible senior notes | (67,333) |  |  | (67,333) |  |  |  |  |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) |  |  |  |  |  |  |  |  | 421,000 |  |  |  |
Common stock issued under employee stock purchase plan | 5,447 |  |  | 5,447 |  |  |  |  |  |  |  |  |
Tax withholding on common stock issued under employee stock purchase plan (in shares) |  |  |  |  |  |  |  |  | (13,000) |  |  |  |
Tax withholding on common stock issued under employee stock purchase plan | (376) |  |  | (376) |  |  |  |  |  |  |  |  |
Stock-based compensation | 13,561 |  |  | 13,561 |  |  |  |  |  |  |  |  |
Net loss | (26,135) |  |  |  | (26,135) |  |  |  | $ (14,773) |  |  | $ (11,362) |
Other comprehensive income (loss) | (183) |  |  |  |  | (183) |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 184,900,249 | 184,900,000 |  | 120,523,936 | 120,524,000 |
Ending balance at Jun. 30, 2020 | $ 835,618 |  |  | $ 1,194,125 | $ (360,031) | $ 1,224 |  |  | $ 184 |  |  | $ 116 |

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