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Accrued Liabilities
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Accrued Liabilities
Accrued Liabilities:

The following table presents the detail of accrued liabilities as of the dates presented:
 
December 31,
 
2016
 
2017
 
 
 
 
Accrued compensation and benefits
$
16,659

 
$
19,543

Legal fees and settlements
2,795

 
2,230

Miscellaneous accrued liabilities
2,799

 
4,832

Total accrued liabilities:
$
22,253

 
$
26,605