Common Stock and Warrants (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified

1 Months Ended

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Feb. 28, 2014

Mar. 31, 2015

Mar. 31, 2014

Common Stock And Warrants Narrative Details

Exchange of warrants

$ 2,300,000

Exchange of warrants, shares

1.1

3.7

Number of shares of common stock issued

7.2

2.0

Loss on warrant exchange

5,000,000

0

(4,967,000)

Cash received from stock sale, before issuance costs

13,900,000

1,000,000

Stock issuance costs

$ 1,000,000

Common shares underlying warrants

2.1

2.1

Warrant terms and provisions

In March 2014, we raised $13.9 million before issuance costs of approximately $1.0 million through an underwritten offering of 7.2 million shares of our common stock and warrants to purchase 2.1 million shares of our common stock.

In February 2014, we issued 3.7 million shares of our common stock under the warrant exchange provisions of our May and September 2013 registered direct offerings. We recognized a loss of $5.0 million on the exchange as the fair market value of the common stock issued was greater than the obligation recorded due to an increase in our stock price since December 31, 2013 to the date the warrants were exchanged.