Restricted Stock Awards (Tables) - Restricted stock

9 Months Ended

Sep. 30, 2018

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Restricted Stock Activity

A summary of unvested restricted stock awards outstanding as of, and changes made during, the nine months ended September 30, 2018, is presented below (shares in thousands):

	Restricted Shares		Weighted Average Grant Price
Unvested restricted stock outstanding, December 31, 2017	341		$	1.06
Vested	(228	)	0.84
Unvested restricted stock outstanding, September 30, 2018	113		$	1.49

Summary of Compensation Expense

Stock-based compensation expense related to restricted stock awards is allocated as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Cost of revenue	$	—	$	2	$	—	$	5
Research and development	—		1		—		4
General and administrative	2		12		14		36
	$	2	$	15	$	14	$	45