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Accrued expenses and other current liabilities
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued expenses and other current liabilities
Accrued expenses and other current liabilities
Accrued expenses and other current liabilities consist of the following as of June 30, 2018 and December 31, 2017 (in thousands):

 
As of June 30,
 
As of December 31,
 
2018
 
2017
Compensation and related benefits, including severance
$
1,571

 
$
2,215

Development, site costs and contract manufacturing
675

 
519

Legal, audit and tax services
1,104

 
1,542

Consulting
59

 
160

Other accrued expenses and other current liabilities
581

 
1,126

 
$
3,990

 
$
5,562



Other accrued expenses consist of accrued costs related to travel, equipment purchases, lab supplies and other miscellaneous costs.
Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consist of the following as of December 31, 2017 and 2016 (in thousands):
 
December 31,
2017
 
December 31,
2016
Compensation and related benefits
$
2,215

 
$
5,869

Development, site costs, and contract manufacturing
519

 
524

Legal, audit and tax services
1,542

 
1,280

Consulting
160

 
888

Deferred rent
334

 
309

Other accrued expenses and other current liabilities
792

 
2,156

 
$
5,562

 
$
11,026


Other accrued expenses consist of accrued costs related to travel, equipment purchases, lab supplies and other miscellaneous costs.