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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stockholders' Equity | Stockholders' Equity Share-based Compensation Expense Total share-based compensation expense recorded for employees and non-employees is as follows (in thousands):
| Three Months Ended March 31,
| 2020 |  | 2019
Cost of revenues | $ | 169 |  |  | $ | 125 |
Research and development | 6,991 |  |  | 4,917 |
Sales and marketing | 2,186 |  |  | 1,808 |
General and administrative | 8,988 |  |  | 8,188 |
Total share-based compensation expense | $ | 18,334 |  |  | $ | 15,038 |
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 | 1,760,947 |  |  | 38.74 |
Released | (2,793,397 | ) |  | 16.89 |
Canceled | (214,121 | ) |  | 28.64 |
Balance at March 31, 2020 | 5,662,959 |  |  | $ | 31.96 |
As of March 31, 2020, our total unrecognized share-based compensation expense related to RSUs and PSUs was approximately $126.5 million, which will be recognized over the remaining weighted-average vesting period of approximately 2.3 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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