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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
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