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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

Summary of preferred stock authorized, issued and outstanding

															Shares Outstanding as of December 31,
			Shares Authorized						Shares Issued						2020						2019
Series C Preferred Stock, par $0.001			1,091						1,091						9						23

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

The following table summarizes total stock options outstanding at December 31, 2020:

						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
$1.48-$3.00						452,749						2.5						$	2.24					428,231						$	2.23
$3.01-$6.00						3,261,410						7.4						$	3.85					1,975,426						$	3.98
$6.01-$9.00						3,879,209						6.5						$	7.59					2,864,794						$	7.33
$9.01-$12.00						365,223						7.2						$	10.42					233,282						$	10.08
$12.01-$15.00						833,282						5.9						$	13.46					546,723						$	13.14
$15.01-$25.62						114,751						9.6						$	20.57					31,041						$	20.59
						8,906,624						6.6						$	6.78					6,079,497						$	6.58

Schedule of stock options, activity

Stock option activity under the Company’s equity incentive plans during the year ended December 31, 2020 was as follows:

			Number of Shares						Weighted-Average Exercise Price
Balance, December 31, 2019			9,265,390						$	5.72
Granted			2,126,182						10.17
Exercised			(2,178,252)						5.63
Cancelled			(306,696)						6.40
Balance, December 31, 2020			8,906,624						$	6.78

Schedule of restricted stock unit activity

Restricted stock unit activity under the Company’s equity incentive plans during the year ended December 31, 2020 was as follows:

			Number of Shares
Balance, December 31, 2019			2,069,936
Granted			1,586,280
Vested			(1,040,628)
Cancelled			(57,536)
Balance, December 31, 2020			2,558,052

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