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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Stockholders' Equity Note [Abstract]

Summary of preferred stock authorized, issued and outstanding

															Shares Outstanding as of December 31,
			Shares Authorized						Shares Issued						2021						2020
Series C Preferred Stock, par $0.001			1,091						1,091						9						9

Schedule of shares authorized under stock option plans, by exercise price range

The following table summarizes total stock options outstanding at December 31, 2021:

						Options Outstanding																		Options Exercisable
Exercise Price						Shares Underlying Options Outstanding						Weighted-Average Remaining Contractual Life (in Years)						Weighted Average Exercise Price						Shares Underlying Options Exercisable						Weighted Average Exercise Price
$1.60-$3.00						272,063						1.8						$	2.25					262,148						$	2.24
$3.01-$6.00						2,583,652						6.8						$	3.80					2,137,202						$	3.88
$6.01-$9.00						4,148,238						6.4						$	7.60					2,848,150						$	7.48
$9.01-$12.00						2,562,668						8.8						$	10.95					827,259						$	10.77
$12.01-$15.00						824,184						5.1						$	13.54					663,646						$	13.40
$15.01-$25.62						98,188						8.6						$	20.64					52,227						$	20.67
						10,488,993						6.9						$	7.93					6,790,632						$	7.22

Schedule of stock options, activity

Stock option activity under the Company’s equity incentive plans during the year ended December 31, 2021 was as follows:

			Number of Shares						Weighted-Average Exercise Price
Balance, December 31, 2020			8,906,624						$	6.78
Granted			3,483,118						10.29
Exercised			(1,310,263)						5.09
Cancelled			(590,486)						10.81
Balance, December 31, 2021			10,488,993						$	7.93

Schedule of restricted stock unit activity

Restricted stock unit activity under the Company’s equity incentive plans during the year ended December 31, 2021 was as follows:

			Number of Shares
Balance, December 31, 2020			2,558,052
Granted			1,392,124
Vested			(1,387,384)
Cancelled			(113,924)
Balance, December 31, 2021			2,448,868

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