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Common Stock and Warrants (Narrative) (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
shares
Public Aug 2017  
Number of shares of common stock issued | shares 5,500,000
Cash received from stock sale, before issuance costs $ 11,500,000
Stock issuance costs $ 1,100,000
Warrant terms and provisions

In August 2017, we raised approximately $11.5 million before issuance costs of approximately $1.1 million through an underwritten public offering of 5.5 million shares of our common stock.

 
Private Aug 2017  
Number of shares of common stock issued | shares 1,500,000
Cash received from stock sale, before issuance costs $ 3,200,000
Stock issuance costs $ 26,000
Warrant terms and provisions

In August 2017, we raised approximately $3.2 million before issuance costs of approximately $26,000 through a private placement of 1.5 million shares of our common stock.

 

 
Earlier Transaction  
Exchange of warrants $ 906,000
Exchange of warrants, shares | shares 460,000
Warrant terms and provisions

During the second quarter of 2017, we received $906,000 from the exercise of warrants to purchase 460,000 shares of common stock, which warrants were issued in connection with earlier financing transactions.

 
May 2017  
Number of shares of common stock issued | shares 1,700,000
Cash received from stock sale, before issuance costs $ 3,700,000
Stock issuance costs $ 125,000
Warrant terms and provisions

In May 2017, we entered into an At-The-Market (ATM) agreement with IFS Securities (DBA Brinson Patrick). During the second quarter of 2017, we received gross proceeds of $3.7 million before issuance costs of approximately $125,000 from the sale of approximately 1.7 million shares of our common stock. The agreement was terminated in June 2017 at our election without penalty.

 

 
June 2017  
Number of shares of common stock issued | shares 1,200,000
Cash received from stock sale, before issuance costs $ 2,200,000
Warrant terms and provisions

During the second quarter of 2017, we received proceeds of $2.2 million from the sale of 1.2 million shares of our common stock as part of the Common Stock Purchase agreement we entered into with Lincoln Park Capital Fund, LLC (Lincoln Park) in September 2016. The agreement was terminated in August 2017 at our election without penalty.