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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Summary of preferred stock authorized, issued and outstanding

							Shares Outstanding as of December 31,
	Shares Authorized			Shares Issued			2019			2018
Series C Preferred Stock, par $0.001	1,091			1,091			23			23

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

The following table summarizes total stock options outstanding at December 31, 2019:

		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		903,257			3.4		$	2.29			848,969			$	2.26
$3.01-$6.00		4,066,998			7.9		$	3.90			1,844,977			$	4.12
$6.01-$9.00		3,454,212			6.1		$	7.20			3,210,448			$	7.24
$9.01-$12.00		220,880			5.8		$	9.83			220,880			$	9.83
$12.01-$15.00		620,043			4.2		$	12.96			620,043			$	12.96
		9,265,390			6.5		$	5.72			6,745,317			$	6.37

Schedule of stock options, activity

Stock option activity under the Company’s equity incentive plans during the year ended December 31, 2019 was as follows:

	Number of Shares			Weighted-Average Exercise Price
Balance, December 31, 2018	8,752,677			$	6.35
Granted	2,596,468			3.39
Exercised	(42,969	)		2.62
Cancelled	(2,040,786	)		5.49
Balance, December 31, 2019	9,265,390			$	5.72

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Restricted stock unit activity under the Company’s equity incentive plans during the year ended December 31, 2019 was as follows:

	Number of Shares
Balance, December 31, 2018	1,688,017
Granted	1,491,771
Vested	(1,003,218	)
Cancelled	(106,634	)
Balance, December 31, 2019	2,069,936

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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