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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Research and development |  | $ | 983 |  | $ | 1,414 |  | $ | 1,890 |  | $ | 2,445 |
General and administrative |  |  | 1,620 |  |  | 1,376 |  |  | 3,138 |  |  | 2,454 |
Total |  | $ | 2,603 |  | $ | 2,790 |  | $ | 5,028 |  | $ | 4,899 |

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