Restructuring Charge (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2017

Dec. 31, 2016

Restructuring Charge

Summary of restructuring charges

Restructuring activity was as follows (in thousands):

			Contractual obligations
	Workforce		and other
	reduction		termination costs		Total
Balance as of March 31, 2017	$	—	$	—	$	—
Restructuring charge		458		594		1,052
Cash payments		(458)		(119)		(577)
Balance as of September 30, 2017	$	—	$	475	$	475

Expenses related to the restructure are included in the restructuring charges line on the condensed consolidated statements of operations and comprehensive loss and the remaining liability is included in accrued expenses and other on the condensed consolidated balance sheet consisting of (in thousands):

			Facility related
	Workforce		and other
	reduction		termination costs		Total
Balance as of December 31, 2015	$	—	$	—	$	—
Restructuring charge		561		115		676
Non-cash settlements		—		(46)		(46)
Cash payments		(561)		(64)		(625)
Balance as of December 31, 2016	$	—	$	5	$	5