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Shareholders' Equity | 6 Months Ended
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Jun. 30, 2013
Shareholders’ Equity [Abstract] |
Stockholders' Equity Note Disclosure [Text Block] | Shareholders' Equity Reverse Stock Split On June 28, 2013, the Company’s board of directors unanimously approved a 1-for-10 reverse stock split of the Company’s common stock, which the Company effected on July 16, 2013. All share and per share amounts of common stock, options and warrants in the accompanying financial statements have been restated for all periods to give retroactive effect to the reverse stock split. The shares of common stock retained a par value of $0.001 per share. Accordingly, the stockholders’ deficit reflects the reverse stock split by reclassifying from “common stock” to “Additional paid-in capital” in an amount equal to the par value of the decreased shares resulting from the reverse stock split. Equity Issuances In September 2011, 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 $20.0 million worth of shares of the Company’s common stock over the term of the Purchase Agreement (initially 24 months). At the Company’s discretion, it may present Aspire Capital with purchase notices under the Purchase Agreement 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 will be based upon one of two formulas set forth in the Purchase Agreement depending on the type of purchase notice we submit to Aspire Capital from time to time, and will be 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 agreement. The Company and Aspire Capital shall not effect any sales under the Purchase Agreement on any date where the closing sales price is less than 75% of the closing sales price on the business day immediately preceding the date of the Purchase Agreement. The Company’s net proceeds will depend on the purchase price and the frequency of the Company’s sales of shares to Aspire Capital; provided, however, that the maximum aggregate proceeds from sales of shares is $20.0 million. The Company’s delivery of purchase notices will be made subject to market conditions, in light of the Company’s capital needs from time to time and under the limitations contained in the Purchase Agreement. As consideration for entering into the Purchase Agreement, effective September 30, 2011, we issued 99,010 shares of our Common Stock to Aspire Capital (the “Commitment Shares”). The issuance of shares of common stock to Aspire Capital pursuant to the Purchase Agreement, including the Commitment Shares, and the sale of those shares from time to time by Aspire Capital to the public, are covered by an effective shelf registration statement on Form S-3. In August 2012, the Company and Aspire entered into an amendment to the Purchase Agreement providing for an extension of the term of the Purchase Agreement until September 30, 2015. Pursuant to the amendment, we agreed to issue to Aspire a five-year warrant to purchase up to 161,290 shares of our common stock at an exercise price of $6.00 per share (the closing price of our common stock on the date the amendment was executed). In the second quarter of 2013, the Company completed an underwritten offering of 2.0 million shares of the Company's common stock, at a public offering price of $5.00 per share. The underwriters also exercised their entire over-allotment option of 300,000 shares. The Company received gross proceeds of $11.5 million, before deducting underwriting discounts and commissions and offering expenses payable by the Company. During the six months ended June 30, 2013, the Company issued 654,255 shares of Common Stock under the provisions of its equity line of credit with Aspire for gross proceeds of approximately $3.8 million. As of June 30, 2013, the remaining amount available to the Company under the Purchase Agreement was $12.9 million. Warrant Exercises To raise capital on terms that we deemed favorable, during the six months ended June 30, 2013, the Board authorized certain inducements to warrant holders to exercise outstanding common stock purchase warrants significantly before their expiration dates. The Company determined in each instance that such inducements were modifications of equity instruments, and an incremental fair value of the inducement was determined using the Black-Scholes option pricing model. During the six months ended ended June 30, 2013, warrant holders exercised an aggregate of 20,761 warrants at an exercise price of $5.10 per share for gross proceeds of approximately $0.1 million. As an inducement to exercise, we paid certain warrant holders $0.30 per share upon each exercise. The incremental fair value of the inducement recorded was $0. Stock Options and Warrants The following table summarizes the activity for stock options and warrants for the six months ended June 30, 2013:
| Stock Options |  | Warrants
| Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2012 | 2,168,668 |  |  | $12.85 |  | 5,528,761 |  |  | $15.65
Changes during the Year: |  |  |  |  |  |  |
Granted | 567,869 |  |  | 6.19 |  | 38,216 |  |  | 10.53
Exercised | — |  |  | — |  | (20,761 | ) |  | 5.10
Forfeited | (28,382 | ) |  | 6.60 |  | — |  |  | —
Expired | (60,718 | ) |  | 16.51 |  | (116,079 | ) |  | 20.61
Outstanding at June 30, 2013 | 2,647,437 |  |  | $11.41 |  | 5,430,137 |  |  | $15.55
During the six months ended June 30, 2013 and 2012, the Company issued warrants for services as follows ($ in thousands, except share data):
|  | Six Months Ended June 30,
|  | 2013 |  | 2012
Number of Common Stock Purchase Warrants Issued |  | 20,407 |  |  | 18,500 |
Value of Common Stock Purchase Warrants Issued |  | $ | 71.6 |  |  | $ | 59.0 |
Restricted Stock During the six months ended June 30, 2013 and 2012, the Company issued restricted stock for services as follows ($ in thousands, except share data):
|  | Six Months Ended June 30,
|  | 2013 |  | 2012
Number of Restricted Stock Issued |  | 304,402 |  |  | 157,702 |
Value of Restricted Stock Issued |  | $ | 1,858.3 |  |  | $ | 708.8 |
The weighted average estimated fair value of restricted stock issued for services in the six months ended June 30, 2013 and 2012 was $6.10 and $4.49 per share, respectively. The fair value of the restricted stock was determined using the Company’s closing stock price on the date of issuance. The vesting terms of restricted stock issuances are generally within one year.

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- Definition The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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