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Preferred Stock and Common Stock

9 Months Ended

Sep. 30, 2019

Temporary Equity Disclosure [Abstract]

8. Preferred Stock and Common Stock

As of September 30, 2019, the Company had 10,000,000 shares of preferred stock and 150,000,000 shares of common stock authorized. None of the authorized preferred stock and 36,443,631 shares of common stock were issued and outstanding as of September 30, 2019.

Reserve for future issuance

The Company has reserved the following number of shares of common stock for future issuance upon the exercise of options, vesting of restricted stock units or grant of equity awards:

	September 30, 2019		December 31, 2018
Options issued and outstanding		2,285,322		1,122,677
Unvested restricted stock units		17,160		24,960
Options available for future grants		1,303,121		1,350,582
Shares available for issuance under the 2018 ESPP		555,583		275,030
Total		4,161,186		2,773,249