Stockholders' Equity

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Stockholders' equity

Stockholders’ Equity

Stock Option Plans

We have two stock option plans – the 2004 Equity Incentive Plan (the “2004 Plan”) and the 2012 Incentive Award Plan (the “2012 Plan”). In February 2020, our Board of Directors authorized a 4.6 million increase in the shares available for grant under the 2012 Plan.

During the three months ended March 31, 2020, we issued 0.1 million shares of our common stock upon the exercise of stock options, compared to 1.5 million shares during the same period of 2019.

The following table summarizes our stock-based compensation:

	Three Months Ended March 31,
	2020		2019
	(in thousands)
Stock-based compensation capitalized in inventory	$	70	$	28
Cost of sales	23		28
Research and development	2,605		1,979
Selling, general and administrative	5,290		4,689
Total stock-based compensation	$	7,988	$	6,724