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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Stock-Based Compensation |
Summary of Stock-Based Compensation Expense Recognized | The following table presents stock-based compensation expense recognized for stock options, restricted stock units, or RSUs, performance-based restricted stock units, or PRSUs, and the Company’s employee stock purchase program, or ESPP, in the Company’s statements of operations (in thousands):
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Research and development |  | $ | 880 |  | $ | 916 |  | $ | 2,770 |  | $ | 3,361 |
General and administrative |  |  | 1,068 |  |  | 1,186 |  |  | 4,206 |  |  | 3,640 |
Total |  | $ | 1,948 |  | $ | 2,102 |  | $ | 6,976 |  | $ | 7,001 |

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