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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Summary of preferred stock authorized, issued and outstanding

							Shares Outstanding as of December 31,
	Shares Authorized			Shares Issued			2017			2016
Series C Preferred Stock, par $0.001	1,091			1,091			23			23

Summary of warrants outstanding

The following table summarizes the warrants outstanding as of December 31, 2017 and 2016:

								As of December 31, 2017							As of December 31, 2016
Issued in Connection With:		Exercise Price				Expiration Date		Number of Warrants			Common Stock Warrant Liability				Number of Warrants			Common Stock Warrant Liability
March 2013 financing		$	3.17			September 12, 2018		284,091			$	360,795			284,091			$	1,167,614
Total								284,091			$	360,795			284,091			$	1,167,614

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

The following table summarizes total stock options outstanding at December 31, 2017:

		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		1,177,183			4.6		$	2.25			1,177,183			$	2.25
$3.01-$6.00		753,932			3.4		$	4.64			668,244			$	4.57
$6.01-$9.00		4,709,442			7.6		$	7.09			2,639,454			$	7.23
$9.01-$12.00		357,603			8.0		$	9.79			263,180			$	9.83
$12.01-$15.00		696,710			6.2		$	12.96			696,710			$	12.96
		7,694,870			6.6		$	6.77			5,444,771			$	6.68

Schedule of stock options, activity

Stock option activity under the Company’s equity incentive plans during the year ended December 31, 2017 was as follows:

	Number of Shares			Weighted-Average Exercise Price
Balance, December 31, 2016	6,806,183			$	6.81
Granted	1,788,121			6.62
Exercised	(452,973	)		5.18
Cancelled	(446,461	)		8.49
Balance, December 31, 2017	7,694,870			$	6.77

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

RSU activity under the Company’s equity incentive plans during the year ended December 31, 2017 was as follows:

	Number of Shares			Weighted-Average Exercise Price
Balance, December 31, 2016	798,834			$	—
Granted	1,035,443			—
Vested	(561,462	)		—
Cancelled	(38,647	)		—
Balance, December 31, 2017	1,234,168			$	—

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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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Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

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Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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