Common Stock (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2020

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of Number of Shares of Common Stock Reserved 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:


	March 31, 2020		December 31, 2019
Options issued and outstanding		2,302,435		2,562,800
Unvested restricted stock units		753,863		828,935
Options available for future grants		2,007,250		215,043
Shares available for issuance under the 2018 ESPP		920,030		555,583

Total		5,983,578		4,162,361

As of December 31, 2019 and 2018, 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:


	As of December 31,
	2019		2018
Options issued and outstanding		2,562,800		1,122,677
Unvested restricted stock units		828,935		24,960
Options available for future grants		212,308		1,350,582
Shares available for issuance under the 2018 ESPP		555,583		275,030

Total		4,159,626		2,773,249