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Stockholders' Equity - (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Schedule of Common Stock | The following table presents a rollforward of our common stock for the three and nine months ended September 30, 2020 and 2019:
| Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
| 2020 | 2019 |  | 2020 | 2019
Shares issued and outstanding, beginning balance | 67,292,864 |  | 69,991,145 |  |  | 69,065,491 |  | 70,596,559 |
Issuance of common stock from vested restricted stock units ¹ | 158,041 |  | 198,478 |  |  | 500,291 |  | 699,188 |
Issuance of common stock from exercise of stock options | 25,075 |  | 23,441 |  |  | 65,684 |  | 163,214 |
Issuance of common stock for employee stock purchase plan | — |  | — |  |  | 130,532 |  | 112,623 |
Repurchase of common stock | (521,137) |  | (307,046) |  |  | (2,688,538) |  | (1,482,655) |
Awards effectively repurchased for required employee withholding taxes | (56,859) |  | (71,765) |  |  | (175,476) |  | (254,676) |
Shares issued and outstanding, ending balance | 66,897,984 |  | 69,834,253 |  |  | 66,897,984 |  | 69,834,253 |
(¹) Net of shares of common stock underlying cancelled RSAs

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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