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Shareholders' Equity
 6 Months Ended
Jun. 30, 2015
Shareholders’ Equity [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
Shareholders' Equity

Equity Issuances

June 2015 Public Offering

In June 2015, the Company completed an underwritten offering of 12.5 million shares of the Company's common stock, at a public offering price of $2.00 per share.  The underwriters also exercised their entire over-allotment option of 1.875 million shares. The Company received gross proceeds of $28.8 million, before deducting underwriting discounts and commissions and offering expenses payable by the Company.

Aspire Purchase Agreements

In May 2015, the Company entered into a common stock purchase agreement (the "2015 Purchase Agreement") with Aspire Capital Fund, LLC, an Illinois limited liability company (“Aspire Capital”), which provides that, subject to certain terms and conditions, Aspire Capital is committed to purchase up to an aggregate of $30 million of shares (limited to a maximum of approximately 8.0 million shares, unless stockholder approval is obtained) of the Company's common stock over a 24-month term. As consideration for entering into the 2015 Purchase Agreement, the Company issued 364,837 shares of its common stock to Aspire Capital. As of June 30, 2015, the full amount was available to the Company under the 2015 Purchase Agreement. As of June 30, 2015, subject to the terms and conditions of the 2015 Purchase Agreement, we could sell to Aspire Capital the lesser of (i) $30 million of Common Stock or (ii) the dollar value of approximately 8.0 million shares of Common Stock based on the market price of the Common Stock at the time of such sale as determined under the 2015 Purchase Agreement.

In March 2014, the Company entered into a common stock purchase agreement (the “2014 Purchase Agreement”) with Aspire Capital, which provides that, subject to certain terms and conditions, Aspire Capital is committed to purchase up to an aggregate of $30.0 million worth of shares (limited to a maximum of approximately 5.7 million shares, unless shareholder approval is obtained) of the Company’s common stock over the 24-month term. As consideration for entering into the 2014 Purchase Agreement, the Company issued 150,000 shares of its common stock to Aspire Capital. During the six months ended June 30, 2015, the Company issued 3.0 million shares of common stock under the provisions of the 2014 Purchase Agreement with Aspire for gross proceeds of approximately $9.4 million. As of June 30, 2015, subject to the terms and conditions of the 2014 Purchase Agreement, we could sell to Aspire Capital the lesser of (i) $9.7 million of Common Stock or (ii) the dollar value of approximately 0.6 million shares of Common Stock based on the market price of the Common Stock at the time of such sale as determined under the 2014 Purchase Agreement.

At the Company’s discretion, it may present Aspire Capital with purchase notices under the 2015 Purchase Agreement or the 2014 Purchase Agreement (collectively, the "Purchase Agreements") from time to time to purchase the Company’s common stock, provided certain price and other requirements are met. The purchase price for the shares of stock is based upon one of two formulas set forth in the Purchase Agreements depending on the type of purchase notice the Company submits to Aspire Capital, and is based on market prices of the Company’s common stock (in the case of regular purchases) or a discount of 5% applied to volume weighted average prices (in the case of VWAP purchases), in each case as determined by parameters defined in the Purchase Agreements.

Stock Options and Warrants

The following table summarizes the activity for stock options and warrants for the six months ended June 30, 2015:

 
 
Stock Options
 
Warrants
 
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value (In Thousands)
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value (In Thousands)
Outstanding at December 31, 2014
 
4,427,234

 
$
9.19

 
6.93
 
$
28.6

 
3,550,956

 
$
14.12

 
2.12
 
$
1.0

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Changes during the period:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
2,903,188

 
$
3.31

 
 
 
 
 
—

 
$
—

 
 
 
 
Exercised
 
—

 
$
—

 
 
 
 
 
—

 
$
—

 
 
 
 
Forfeited
 
(103,513
)
 
$
6.52

 
 
 
 
 
—

 
$
—

 
 
 
 
Expired
 
(302,450
)
 
$
7.19

 
 
 
 
 
(32,004
)
 
$
19.37

 
 
 
 
Outstanding at June 30, 2015
 
6,924,459

 
$
6.86

 
7.77
 
$
—

 
3,518,952

 
$
14.07

 
1.65
 
$
—

Vested at June 30, 2015 or expected to vest in the future
 
6,616,000

 
$
7.00

 
7.69
 
$
—

 
3,518,952

 
$
14.07

 
1.65
 
$
—

Vested at June 30, 2015
 
4,726,752

 
$
8.00

 
7.12
 
$
—

 
3,516,452

 
$
14.07

 
1.64
 
$
—




Restricted Stock

During the six months ended June 30, 2015 and 2014, the Company issued restricted stock for services as follows (in thousands, except share data):

 
 
Six Months Ended June 30,
  
 
2015
 
2014
Number of Restricted Stock Issued
 
1,276,053

 
456,709

Value of Restricted Stock Issued
 
$
4,029.5

 
$
3,389.7



The weighted average estimated fair value of restricted stock issued for services in the six months ended June 30, 2015 and 2014 was $3.16 and $7.42 per share, respectively. The fair value of the restricted stock was determined using the Company’s closing stock price on the date of issuance.