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Restructuring Charges (Tables)
 3 Months Ended
Mar. 31, 2018
Restructuring And Related Activities [Abstract]  
Summary of Components of Restructuring Activity

The following table summarizes the components of the Company’s restructuring activity recorded in the accompanying balance sheets (in thousands):

 

 

 

Amounts accrued at December 31, 2017

 

 

Expense incurred

 

 

Amounts paid

 

 

Amounts accrued at March 31, 2018

 

Employee severance, benefits and related costs

 

$

72

 

 

$

—

 

 

$

(72

)

 

$

—

 

Obligations under manufacturing and development

   contracts

 

 

283

 

 

 

—

 

 

 

(113

)

 

 

170

 

 

 

$

355

 

 

$

—

 

 

$

(185

)

 

$

170