Restricted Stock Awards (Tables) - Restricted stock

3 Months Ended

Mar. 31, 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 three months ended March 31, 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, March 31, 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
	March 31,
	2018		2017
Cost of revenue	$	—	$	2
Research and development	—		1
General and administrative	10		12
	$	10	$	15