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Stock-Based Compensation Expense (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Based Compensation Expense Recognized in Accompanying Consolidated Statements of Operations | Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017 are as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Stock-based compensation |  | $ | 1,562 |  |  | $ | 1,247 |  |  | $ | 5,715 |  |  | $ | 3,763 |

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