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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2021

Class Of Stock Disclosures [Abstract]

Schedule of Common Stock Reserved for Future Issuance

The following table presents common stock reserved for future issuance(1) (in thousands):


	June 30,		December 31,
	2021		2020
Warrants issued and outstanding		10		51
Stock option awards issued and outstanding		1,919		1,760
Authorized for grants under the 2016 Equity Incentive Plan(2)		424		357
Authorized for grants under the Inducement Plan(3)		155		—
Authorized for grants under the 2016 Employee Stock Purchase Plan(4)		343		256
		2,851		2,424

(1) Treasury stock in the amount of 534,000 as of June 30, 2021 and December 31, 2020 are excluded from the table above.

(2) On January 1, 2021, the number of authorized shares in the 2016 Plan increased by 391,356 shares pursuant to the evergreen provisions of the 2016 Plan.

(3) On January 7, 2021, 300,000 shares were authorized pursuant to the terms of the Inducement Plan; 147,500 shares were issued under the Inducement Plan during the six months ended June 30, 2021

(4) On January 1, 2021, the number of authorized shares in the 2016 Employee Stock Purchase Plan increased by 98,000 shares pursuant to the evergreen provisions of the 2016 Employee Stock Purchase Plan.