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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Depreciation Expense Excluded From Each Line Item in Consolidated Statements of Operations | The following table summarizes depreciation expense excluded from each line item in our condensed consolidated statements of operations (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of revenues |  | $ | 1,639 |  |  | $ | 1,485 |  |  | $ | 3,246 |  |  | $ | 2,942 |
Operating expense |  | 6,501 |  |  | 5,544 |  |  | 13,405 |  |  | 11,178 |
General and administrative expense |  | 901 |  |  | 650 |  |  | 2,048 |  |  | 1,371 |

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