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Common Stock Issuance (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash received from stock sale, before issuance costs $ 19,356,000 $ 22,869,000 $ 3,206,000
March 2015      
Cash received from stock sale, before issuance costs $ 1,000,000    
Terms and provisions

During the three months ended March 31, 2015, we received gross proceeds of approximately $1.0 million as part of an ATM agreement we entered into with Meyers Associates, L.P. in June 2014. We have completed sales under this agreement, having received total proceeds of approximately $4.5 million before issuance costs of approximately $206,000 from the sale of 2.0 million shares of our common stock.

 

 

    
December 2015      
Number of shares of common stock issued 1,500,000    
Cash received from stock sale, before issuance costs $ 3,300,000    
Terms and provisions

During the year ended December 31, 2015, we received approximately $3.3 million from the exercise of warrants to purchase 1.5 million shares of our common stock, which warrants were issued in connection with earlier financing transactions.

 

 

    
May 2015      
Number of shares of common stock issued 1,200,000    
Cash received from stock sale, before issuance costs $ 3,100,000    
Stock issuance costs $ 109,000    
Terms and provisions

In May 2015, we entered into an ATM agreement with Meyers Associates, L.P. Under the terms of the agreement, we may, from time to time, at our discretion, offer and sell shares of our common stock having an aggregate value of up to $6.0 million. As of December 31, 2016, we have received gross proceeds of approximately $3.1 million before issuance costs of approximately $109,000 from the sale of 1.2 million shares of our common stock. There were no sales under this agreement in 2017. The agreement was terminated in May 2017 in accordance with its terms without penalty.

 

 

    
March 2016      
Number of shares of common stock issued 4,100,000    
Cash received from stock sale, before issuance costs $ 6,900,000    
Stock issuance costs $ 650,000    
Terms and provisions

In March 2016, we raised approximately $6.9 million before issuance costs of approximately $650,000 through an underwritten public offering of approximately 4.1 million shares of our common stock. The offering included the exercise in full of the underwriter's option to purchase up to an additional 529,411 shares of our common stock.

 

 

    
Public August 2017      
Number of shares of common stock issued 5,500,000    
Cash received from stock sale, before issuance costs $ 11,500,000    
Stock issuance costs $ 1,100,000    
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 August 2017      
Number of shares of common stock issued 1,500,000    
Cash received from stock sale, before issuance costs $ 3,200,000    
Stock issuance costs $ 26,000    
December Registered 2016      
Number of shares of common stock issued 2,000,000    
Cash received from stock sale, before issuance costs $ 2,100,000    
Stock issuance costs $ 18,000    
Terms and provisions

In December 2016, we raised approximately $2.1 million before issuance costs of approximately $18,000 through a registered direct offering of 2.0 million shares of our common stock.

 

 

    
December Public 2016      
Number of shares of common stock issued 12,100,000    
Cash received from stock sale, before issuance costs $ 13,000,000    
Stock issuance costs $ 1,200,000    
Terms and provisions

In December 2016, we raised approximately $13.0 million before issuance costs of approximately $1.2 million through an underwritten public offering of approximately 12.1 million shares of our common stock.