Restricted Stock Units (Tables) - Restricted Stock Units (RSUs)

6 Months Ended

Jun. 30, 2018

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

Summary of Restricted Stock Units Activity

A summary of unvested restricted stock units (“RSUs”) outstanding as of, and changes made during, the six months ended June 30, 2018, is presented below (shares in thousands):

	RSUs		Weighted Average Grant Price
Unvested restricted stock units outstanding, December 31, 2017	1,752		$	0.57
Granted	1,410		0.22
Vested	(306	)	0.51
Forfeited	(463	)	0.28
Unvested restricted stock units outstanding, June 30, 2018	2,393		$	0.72

Summary of Compensation Expense

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Cost of revenue	$	12	$	8	$	17	$	19
Research and development	18		14		28		29
Sales and marketing	2		—		4		4
General and administrative	75		80		98		180
	$	107	$	102	$	147	$	232