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

9 Months Ended

Sep. 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 nine months ended September 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	(553	)	0.75
Forfeited	(472	)	0.28
Unvested restricted stock units outstanding, September 30, 2018	2,137		$	0.35

Summary of Compensation Expense

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Cost of revenue	$	13	$	10	$	30	$	29
Research and development	18		14		47		43
Sales and marketing	1		2		5		6
General and administrative	76		55		174		236
	$	108	$	81	$	256	$	314