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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 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 consolidated statements of operations (in thousands):
|  | Three Months Ended March 31,
|  | 2018 |  | 2017
Cost of revenues |  | $ | 1,607 |  |  | $ | 1,457 |
Operating expense |  | 6,904 |  |  | 5,634 |
General and administrative expense |  | 1,147 |  |  | 721 |

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