Stockholders' Equity

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Convertible Preferred Stock

The Company did not have any convertible preferred stock issued and outstanding as of December 31, 2018 and 2017.

The Company has not declared or paid any dividends in 2018, 2017 or 2016.

Common Stock

The Company has reserved sufficient shares of common stock for issuance upon the exercise of stock options and the exercise of warrants. Common stockholders are entitled to dividends if and when declared by the board of directors, subject to the prior rights of the preferred stockholders. As of December 31, 2018, no common stock dividends had been declared by the board of directors.

The Company has reserved shares of common stock for issuance as follows (in thousands):

	December 31,
	2018	2017
Stock plans
Shares available for grant
2015 Equity Incentive Plan	11,986	8,857
2015 Employee Stock Purchase Plan	5,202	3,970
Options outstanding	13,590	16,268
Restricted stock units outstanding	4,182	5,330
Total	34,960	34,425