Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Stock option activity during the three months ended March 31, 2019, was as follows (in thousands, except per share amounts):



	Stock Options Outstanding
	Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value ⁽¹⁾
				(in years)
Outstanding as of December 31, 2018	76,635	$	2.22	4.5	$	1,285,338
Exercised	(73)	2.58
Forfeited	(6)	3.84
Outstanding as of March 31, 2019	76,556	$	2.22	4.3	$	1,339,176
Exercisable as of March 31, 2019	76,351	$	2.21	4.3	$	1,335,964


(1)	We calculate intrinsic value based on the difference between the exercise price of in-the-money-stock options and the fair value of our common stock as of the respective balance sheet date.

RSU activity during the three months ended March 31, 2019, was as follows (in thousands, except per share amounts):



	Restricted Stock Units Outstanding
	Shares	Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2018	77,882	$	17.79
Granted	28,531	19.60
Forfeited	(2,486)	18.43
Outstanding as of March 31, 2019	103,927	$	18.27

Share-based compensation expense during the three months ended March 31, 2019 and 2018, was as follows (in thousands):



	Three Months Ended March 31,
	2019		2018
Cost of revenue	$	15	$	32
Research and development	626		4,054
Sales and marketing	29		241
General and administrative	24		507
Total share-based compensation	$	694	$	4,834