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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders' Equity Note [Abstract]

Summary of preferred stock authorized, issued and outstanding

							Outstanding as of December 31,
	Authorized			Issued			2016			2015
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, 2016 and 2015:

								As of December 31, 2016							As of December 31, 2015
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			$	1,167,614			284,091			$	1,301,138
Warrants assumed in June 2009 Merger		$ 4.08 - 5.12				April 28, 2016		—			—				276,813			—
Total								284,091			$	1,167,614			560,904			$	1,301,138

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

The following table summarizes total stock options outstanding at December 31, 2016:

		Options Outstanding									Options Exercisable
Exercise Price		Options Outstanding			Weighted-Average Remaining Contractual Life (in Years)		Weighted Average Exercise Price				Options Exercisable			Weighted-Average Exercise Price
$0.00-$3.00		1,184,058			5.6		$	2.25			1,184,058			$	2.25
$3.01-$6.00		1,063,941			2.1		$	4.76			1,055,351			$	4.75
$6.01-$9.00		3,337,860			7.7		$	7.25			1,668,725			$	7.23
$9.01-$12.00		418,612			8.6		$	9.75			155,420			$	9.92
$12.01-$15.00		801,712			6.4		$	12.94			626,277			$	12.93
		6,806,183			6.3		$	6.81			4,689,831			$	6.26

Schedule of stock options, activity

Stock option activity under our equity incentive plans was as follows:

	Number of Shares			Weighted-Average Exercise Price
Balance, December 31, 2015	5,862,364			$	6.46
Granted	1,705,169			7.47
Exercised	(631,065	)		4.96
Cancelled	(130,285	)		8.66
Balance, December 31, 2016	6,806,183			$	6.81

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

RSU activity under our equity incentive plans was as follows:

	Number of Shares			Weighted-Average Exercise Price
Balance, December 31, 2015	230,000			$	—
Granted	671,500			—
Vested	(96,666	)		—
Cancelled	(6,000	)		—
Balance, December 31, 2016	798,834			$	—

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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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