Restructuring Costs (Tables)

6 Months Ended

Jun. 30, 2018

Restructuring Costs

Summary of accrued restructuring costs, included as a component of accrued liabilities

	December 31, 2017		Charges		Payments		June 30, 2018
Accrued severance	$	—		380		(52)		328
Accrued retention bonus		—		36		—		36
Total	$	—	$	416	$	(52)	$	364