The following table summarizes our stock option activity from December 31, 2017 through December 31, 2018:



	Number of Shares	Weighted-Average Exercise Price Per Share	Weighted-Average Remaining Contract Term in Years	Aggregate Intrinsic Value (in thousands)⁽¹⁾
Outstanding stock options as of December 31, 2017	4,269,910	$6.78
Forfeited	(527,000)	15.43
Exercised	(3,000)	3.84
Outstanding stock options as of December 31, 2018	3,739,910	$5.56	4.0	$	—

Stock options exercisable as of December 31, 2018	3,259,125	$5.91	3.5	$	—

(1) Intrinsic value is the amount by which the market price of our common stock exceeds the exercise price of the stock options.

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