Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes the activity of the 2007 Plan for options:

					Weighted Average
			Weighted-Average		Remaining
	Shares		Exercise Price		Contractual Term

Options
Outstanding, January 1, 2013		6,225,612	$	2.52		7.4
Granted		240,000		1.65
Exercised		(61,756)		1.21
Forfeited		(390,694)		2.20
Expired		(39,123)		2.96
Outstanding, December 31, 2013		5,974,039	$	2.52		6.5
Granted		2,547,585		1.81
Exercised		(352,718)		1.29
Forfeited		(635,424)		2.61
Expired		(143,588)		3.04
Outstanding, December 31, 2014		7,389,894	$	2.31		6.9
Granted		369,814		1.66
Exercised		(778,783)		1.25
Forfeited		(2,712,613)		2.43
Expired		(77,308)		3.26
Outstanding, December 31, 2015		4,191,004	$	2.36		6.0

Exercisable, December 31, 2015		3,284,406	$	2.54		5.3
Vested and expected to vest, December 31, 2015		4,082,212	$	2.40		5.9

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value for the 2015, 2014 and 2013 awards were estimated at the date of grant using the Black-Scholes option-pricing model using the following assumptions:

	December 31,
	2015			2014			2013

Weighted-average volatility		70	%		84	%		86	%
Risk-free rate		1.50% - 2.25	%		1.51% - 2.25	%		0.96% - 1.90	%
Expected annual dividend yield		-			-			-
Expected weighted-average life, in years		5.7			6.1			5.6

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table summarizes the activity of the 2007 plan for restricted shares:

	Shares		Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value

Restricted shares
Outstanding, January 1, 2013		13,333	$	1.59	$	14,933
Granted		-		-
Vested		(6,666)		1.59
Forfeited or expired		-		-
Outstanding, December 31, 2013		6,667	$	1.59	$	12,401
Granted		-		-
Vested		(6,667)		1.59
Forfeited or expired		-		-
Outstanding, December 31, 2014		-	$	-	$	-
Granted		877,244		1.77
Vested		-		-
Forfeited or expired		(25,000)		1.71
Outstanding, December 31, 2015		852,244	$	1.78	$	1,619,264

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

The warrants outstanding as of December 31, 2015 were as follows:

Number of Common Shares Underlying Warrants		Issue Date/Exercisable Date	Exercise Price		Expiration Date

100,778	⁽¹⁾	March 2007/March 2007	$	3.97	March 2017
903,996	⁽²⁾	July 2010/January 2011	$	1.63	January 2017
371,423	⁽²⁾	June 2011/June 2011	$	3.50	June 2016
46,584	⁽¹⁾	March 2012/March 2012	$	1.61	March 2022
1,422,781

⁽¹⁾

These warrants to purchase common stock are classified as equity.

⁽²⁾

Because of the presence of net settlement provisions, these warrants to purchase common stock are classified as derivative liabilities. The fair value of these liabilities (see Note 3 – Fair Value Measurements) is remeasured at the end of every reporting period and the change in fair value is reported in the accompanying consolidated statements of operations as other income (expense).

- Definition

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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