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Stock-Based Compensation Expense (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2018 and 2017 are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Stock-based compensation |  | $ | 2,209 |  |  | $ | 1,250 |  |  | $ | 4,152 |  |  | $ | 2,516 |

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