Stockholders' Equity	3 Months Ended
Mar. 31, 2013
Stockholders' Equity [Abstract]
Stockholders' Equity	Note 4 – Stockholders' Equity At-the-Market Programs (ATM Program) On February 11, 2013, we entered into an At-the-Market Equity Offering Sales Agreement (ATM Program) with Stifel pursuant to which Stifel, as our exclusive agent, at our discretion and at such times that we may determine from time to time, may sell up to a maximum of $25 million of our common stock over a three-year period. We are not required to sell any common stock at any time during the term of the ATM Program. If we issue a sale notice to Stifel, we may designate the minimum price per share at which our common stock may be sold and the maximum number of shares that Stifel is directed to sell during any selling period. As a result, prices are expected to vary as between purchasers and during the term of the offering. Stifel may sell shares by any method deemed to be an "at-the-market" equity offering as defined in Rule 415 promulgated under the Securities Act of 1933, as amended, which may include ordinary brokers' transactions on The Nasdaq Capital Market, or otherwise at market prices prevailing at the time of sale or prices related to such prevailing market prices, or as otherwise agreed by Stifel and us. The shares to be offered under the ATM Program are registered under our universal shelf registration statement on Form S-3 that we filed with the SEC on June 8, 2011 (2011 Universal Shelf). Either party may suspend the ATM Program by notice to the other party. The ATM Program will terminate upon the earliest of: (1) the sale of all shares of common stock issuable thereunder, (2) February 11, 2016 or (3) other termination in accordance with the terms of the related agreement. Either party may terminate the ATM Program at any time upon written notification to the other party in accordance with the related agreement. We have agreed to pay Stifel a commission equal to 3.0% of the gross sales price of shares sold pursuant to the ATM Program. With the exception of expenses related to the shares of common stock, Stifel will be responsible for all of its own costs and expenses incurred in connection with the ATM Program.

Note 4 – Stockholders' Equity

At-the-Market Programs (ATM Program)

On February 11, 2013, we entered into an At-the-Market Equity Offering Sales Agreement (ATM Program) with Stifel pursuant to which Stifel, as our exclusive agent, at our discretion and at such times that we may determine from time to time, may sell up to a maximum of $25 million of our common stock over a three-year period. We are not required to sell any common stock at any time during the term of the ATM Program. If we issue a sale notice to Stifel, we may designate the minimum price per share at which our common stock may be sold and the maximum number of shares that Stifel is directed to sell during any selling period. As a result, prices are expected to vary as between purchasers and during the term of the offering. Stifel may sell shares by any method deemed to be an "at-the-market" equity offering as defined in Rule 415 promulgated under the Securities Act of 1933, as amended, which may include ordinary brokers' transactions on The Nasdaq Capital Market, or otherwise at market prices prevailing at the time of sale or prices related to such prevailing market prices, or as otherwise agreed by Stifel and us. The shares to be offered under the ATM Program are registered under our universal shelf registration statement on Form S-3 that we filed with the SEC on June 8, 2011 (2011 Universal Shelf).

Either party may suspend the ATM Program by notice to the other party. The ATM Program will terminate upon the earliest of: (1) the sale of all shares of common stock issuable thereunder, (2) February 11, 2016 or (3) other termination in accordance with the terms of the related agreement. Either party may terminate the ATM Program at any time upon written notification to the other party in accordance with the related agreement.

We have agreed to pay Stifel a commission equal to 3.0% of the gross sales price of shares sold pursuant to the ATM Program. With the exception of expenses related to the shares of common stock, Stifel will be responsible for all of its own costs and expenses incurred in connection with the ATM Program.