Common Stock Issuances	9 Months Ended
Sep. 30, 2012
Change in Accumulated Balance of Component of Other Comprehensive Loss and Common Stock Issuances [Abstract]
Common Stock Issuances	(11) Common Stock Issuances (a) Cowen Sales Agreement On April 12, 2012, the Company entered into a sales agreement (the “Sales Agreement”) with Cowen and Company, LLC (“Cowen”) pursuant to which the Company may issue and sell shares of its common stock, having an aggregate offering price of up to $10,000,000 from time to time through Cowen as its sales agent. Cowen may sell the Company’s common stock by methods deemed to be an “at-the-market” offering (the “Offering”), as defined under the Securities Act of 1933, as amended, including sales made directly on the Nasdaq Global Market, on any other existing trading market for the common stock or to or through a market maker other than on an exchange. With the Company’s prior written approval, Cowen may also sell the Company’s common stock by any other method permitted by law, including in privately negotiated transactions. Cowen has agreed to offer the common stock subject to the terms and conditions of the Sales Agreement on a daily basis or as otherwise agreed upon by the Company and Cowen. The Company will designate the maximum amount of common stock to be sold through Cowen on a daily basis or otherwise determine such maximum amount together with Cowen. Subject to the terms and conditions of the Sales Agreement, Cowen has agreed to use its commercially reasonable efforts to sell on the Company’s behalf all of the shares of common stock requested to be sold by the Company. The Company may instruct Cowen not to sell common stock if the sales cannot be effected at or above the price designated by the Company in any such instruction. The Company or Cowen may suspend the offering of the common stock being made through Cowen under the Sales Agreement upon proper notice to the other party. The Company and Cowen each have the right, by giving written notice as specified in the Sales Agreement, to terminate the sales agreement in each party’s sole discretion at any time. The Sales Agreement provides that Cowen will be entitled to aggregate compensation for its services equal to 3.0% of the gross sales price per share of all shares sold through Cowen under the Sales Agreement. The Company has no obligation to sell any shares under the Sales Agreement. The Company has agreed in the Sales Agreement to provide indemnification and contribution to Cowen against certain liabilities, including liabilities under the Securities Act. In addition, the Company has agreed, under certain circumstances, to reimburse a portion of the expenses of Cowen in connection with the Offering up to a maximum of $50,000. The shares will be issued pursuant to the Company’s shelf registration statement on Form S–3 (File No. 333-169060). The Company has not sold any shares under the Sales Agreement as of September 30, 2012. (b) Employee Stock Purchases During the nine months ended September 30, 2012 and 2011, the Company issued 3,006 shares and 23,537 shares, respectively, of common stock in connection with employee stock purchases under the Company’s 1995 Employee Stock Purchase Plan, which resulted in total proceeds to the Company of $3,000 and $47,000, respectively.

Common Stock Issuances

9 Months Ended

Sep. 30, 2012

Change in Accumulated Balance of Component of Other Comprehensive Loss and Common Stock Issuances [Abstract]

(11) Common Stock Issuances

(a) Cowen Sales Agreement

On April 12, 2012, the Company entered into a sales agreement (the “Sales Agreement”) with Cowen and Company, LLC (“Cowen”) pursuant to which the Company may issue and sell shares of its common stock, having an aggregate offering price of up to $10,000,000 from time to time through Cowen as its sales agent. Cowen may sell the Company’s common stock by methods deemed to be an “at-the-market” offering (the “Offering”), as defined under the Securities Act of 1933, as amended, including sales made directly on the Nasdaq Global Market, on any other existing trading market for the common stock or to or through a market maker other than on an exchange. With the Company’s prior written approval, Cowen may also sell the Company’s common stock by any other method permitted by law, including in privately negotiated transactions.

Cowen has agreed to offer the common stock subject to the terms and conditions of the Sales Agreement on a daily basis or as otherwise agreed upon by the Company and Cowen. The Company will designate the maximum amount of common stock to be sold through Cowen on a daily basis or otherwise determine such maximum amount together with Cowen. Subject to the terms and conditions of the Sales Agreement, Cowen has agreed to use its commercially reasonable efforts to sell on the Company’s behalf all of the shares of common stock requested to be sold by the Company. The Company may instruct Cowen not to sell common stock if the sales cannot be effected at or above the price designated by the Company in any such instruction. The Company or Cowen may suspend the offering of the common stock being made through Cowen under the Sales Agreement upon proper notice to the other party. The Company and Cowen each have the right, by giving written notice as specified in the Sales Agreement, to terminate the sales agreement in each party’s sole discretion at any time.

The Sales Agreement provides that Cowen will be entitled to aggregate compensation for its services equal to 3.0% of the gross sales price per share of all shares sold through Cowen under the Sales Agreement. The Company has no obligation to sell any shares under the Sales Agreement. The Company has agreed in the Sales Agreement to provide indemnification and contribution to Cowen against certain liabilities, including liabilities under the Securities Act. In addition, the Company has agreed, under certain circumstances, to reimburse a portion of the expenses of Cowen in connection with the Offering up to a maximum of $50,000. The shares will be issued pursuant to the Company’s shelf registration statement on Form S–3 (File No. 333-169060).

The Company has not sold any shares under the Sales Agreement as of September 30, 2012.

(b) Employee Stock Purchases

During the nine months ended September 30, 2012 and 2011, the Company issued 3,006 shares and 23,537 shares, respectively, of common stock in connection with employee stock purchases under the Company’s 1995 Employee Stock Purchase Plan, which resulted in total proceeds to the Company of $3,000 and $47,000, respectively.