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Shareholders' Equity
 9 Months Ended
Sep. 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 November 2015, the Company entered into a common stock purchase agreement (the "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 11.0 million shares, unless stockholder approval is obtained or certain minimum sale price levels are reached) of the Company's common stock over a 24-month term. As consideration for entering into the Purchase Agreement, the Company issued 842,696 shares of its common stock to Aspire Capital (see Note 16).

Under the Purchase Agreement, at the Company’s discretion, it may present Aspire Capital with purchase notices 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 common stock is based upon one of two formulas set forth in the Purchase Agreement 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. We have filed a registration statement with the SEC and a related prospectus supplement that covers the offering of shares of our common stock subject to the Purchase Agreement, and therefore can initiate sales to Aspire at any time.

We are party to two existing agreements with Aspire Capital (the "May 2015 Purchase Agreement" and the "March 2014 Purchase Agreement", or collectively, the "Previous Purchase Agreements"). The registration statement we previously filed with the SEC to cover offerings of shares of our common stock subject to the previous Purchase Agreements has expired, and we have not, and currently have no intention to include such shares in a registration statement filed with the SEC. Unless and until we include such shares in a registration statement filed with the SEC, we are unable to initiate sales to Aspire under the Previous Purchase Agreements.

Under the May 2015 Purchase Agreement, Aspire Capital is committed to purchase up to an aggregate of $30 million of shares. As consideration for entering into the May 2015 Purchase Agreement, the Company issued 364,837 shares of its common stock to Aspire Capital. The Company has not issued any additional shares under the May 2015 Purchase Agreement. Under the March 2014 Purchase Agreement, Aspire Capital is committed to purchase up to an aggregate of $30.0 million of shares. As consideration for entering into the March 2014 Purchase Agreement, the Company issued 150,000 shares of its common stock to Aspire Capital. During the nine months ended September 30, 2015, the Company issued 3.0 million shares of common stock under the March 2014 Purchase Agreement with Aspire for gross proceeds of $9.4 million. Overall, the Company issued 5.1 million shares under the March 2014 Purchase Agreement for gross proceeds of $20.3 million.


Stock Options and Warrants

The following table summarizes the activity for stock options and warrants for the nine months ended September 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
 
3,036,688

 
$
3.23

 
 
 
 
 
—

 
$
—

 
 
 
 
Exercised
 
—

 
$
—

 
 
 
 
 
—

 
$
—

 
 
 
 
Forfeited
 
(370,588
)
 
$
5.32

 
 
 
 
 
—

 
$
—

 
 
 
 
Expired
 
(481,854
)
 
$
7.34

 
 
 
 
 
(34,504
)
 
$
19.78

 
 
 
 
Outstanding at September 30, 2015
 
6,611,480

 
$
6.82

 
7.36
 
$
15.2

 
3,516,452

 
$
14.06

 
1.39
 
$
—

Vested at September 30, 2015 or expected to vest in the future
 
6,362,987

 
$
6.94

 
7.28
 
$
13.2

 
3,516,452

 
$
14.06

 
1.39
 
$
—

Vested at September 30, 2015
 
4,685,074

 
$
7.91

 
6.69
 
$
—

 
3,516,452

 
$
14.06

 
1.39
 
$
—




Restricted Stock

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

 
 
Nine Months Ended September 30,
  
 
2015
 
2014
Number of Restricted Stock Issued
 
811,835

 
708,706

Value of Restricted Stock Issued
 
$
2,367.5

 
$
4,964.0



The weighted average estimated fair value of restricted stock issued for services in the nine months ended September 30, 2015 and 2014 was $3.10 and $7.00 per share, respectively. The fair value of the restricted stock was determined using the Company’s closing stock price on the date of issuance.