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Accrued Expense
12 Months Ended
Dec. 31, 2016
Payables and Accruals [Abstract]  
Accrued Expense
Accrued Expense
 
December 31,
 
2016
 
2015
Accrued research and development expenses
$
318

 
$
1,903

Accrued employee bonus compensation
730

 
776

Employee withholdings
22

 
42

Other accrued expenses
198

 
428

Total accrued expenses
$
1,268

 
$
3,149