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Stockholders' Equity | 9 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
Stockholders' Equity | Stockholders' Equity Securities Repurchase Program In June 2020, our board of directors approved a securities repurchase program pursuant to which we may, from time to time, repurchase up to $500.0 million of our common stock and/or convertible notes, through open market purchases, block trades, and/or privately negotiated transactions or pursuant to Rule 10b5-1 plans, in compliance with applicable securities laws and other legal requirements. The timing, volume, and nature of the repurchases will be determined by management based on the capital needs of the business, market conditions, applicable legal requirements, and other factors. The repurchase program will end on December 31, 2021. There were no securities repurchased during the three months ended September 30, 2020. Share-based Compensation Expense Total share-based compensation expense recorded for employees and non-employees is as follows (in thousands):
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Cost of revenues | $ | 262 |  |  | $ | 96 |  |  | $ | 644 |  |  | $ | 295 |
Research and development | 8,433 |  |  | 5,741 |  |  | 23,044 |  |  | 15,876 |
Sales and marketing | 2,431 |  |  | 1,843 |  |  | 7,053 |  |  | 5,405 |
General and administrative | 10,403 |  |  | 9,185 |  |  | 28,668 |  |  | 25,779 |
Total share-based compensation expense | $ | 21,529 |  |  | $ | 16,865 |  |  | $ | 59,409 |  |  | $ | 47,355 |
RSU and PSU Activity Activity for RSUs and PSUs is as follows:
| RSUs and PSUs Outstanding |  |
| Shares Outstanding |  | Weighted Average Grant Date Fair Value
Balance at December 31, 2019 | 6,909,530 |  |  | $ | 24.04 |
Granted | 2,462,160 |  |  | 43.54 |
Released | (3,591,076) |  |  | 18.89 |
Canceled | (409,544) |  |  | 30.57 |
Balance at September 30, 2020 | 5,371,070 |  |  | $ | 35.92 |
As of September 30, 2020, our total unrecognized share-based compensation expense related to RSUs and PSUs was approximately $122.8 million, which will be recognized over the remaining weighted-average vesting period of approximately 2.0 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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