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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Class Of Stock Disclosures [Abstract]

Schedule of Common Stock Reserved for Future Issuance

The following common stock is reserved for future issuance at⁽¹⁾:

	June 30, 2019			December 31, 2018
Warrants issued and outstanding		51,003			51,003
Stock option awards issued and outstanding		1,553,169			1,407,049
Authorized for grants under the 2016 Equity Incentive Plan		477,477	(2)		463,491
Authorized for grants under the 2016 Employee Stock Purchase Plan		196,011	(3)		100,000
		2,277,660			2,021,543

⁽¹⁾ Treasury stock in the amount of 371,664 and 357,314 as of June 30, 2019 and December 31, 2018, respectively, are excluded from the table above.

⁽²⁾ On January 1, 2019, the number of authorized shares in the 2016 Equity Incentive Plan increased by 384,045 shares pursuant to the evergreen provisions of the 2016 Equity Incentive Plan.

⁽³⁾ On January 1, 2019, the number of authorized shares in the 2016 Employee Stock Purchase Plan increased by 96,011 shares pursuant to the evergreen provisions of the 2016 Employee Stock Purchase Plan.