Common Stock and Warrants (Narrative) (Details) - USD ($)

1 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2016

Mar. 31, 2016

Mar. 31, 2015

Sep. 30, 2016

Sep. 30, 2015

Common Stock And Warrants Narrative Details

Exchange of warrants, shares

1,500,000

Cash on exercise of warrants

$ 3,300,000

Commitment fee, shares

522,556

Commitment fee

$ 721,000

Cash received from stock sale, before issuance costs

2,000,000

$ 6,900,000

$ 1,000,000

$ 845,000

Stock issuance costs

$ 133,000

$ 650,000

Warrant terms and provisions

In September 2016, we entered into a Common Stock Purchase Agreement with Lincoln Park Capital Fund, LLC (Lincoln Park) granting us the right to sell shares of our common stock having an aggregate value of up to $17.0 million. Under the terms of the agreement, Lincoln Park made an initial purchase of $2.0 million in shares of common stock at a purchase price of $1.50 per share. Subject to various limitations and conditions set forth in the agreement, including a $1.00 minimum stock price, we may sell up to an additional $15.0 million in shares of common stock, from time to time, at our sole discretion to Lincoln Park over a twenty-four month period beginning September 2016. In consideration for entering into the agreement, we issued 522,556 shares of common stock, having a value of $721,000 based on the closing stock price on the date of grant, to Lincoln Park as a commitment fee. We incurred an additional $133,000 in issuance costs.

In March 2016, we raised $6.9 million before issuance costs of approximately $650,000 from the sale of 4.1 million shares of common stock in an underwritten public offering.

During the three months ended March 31, 2015, we received gross proceeds of $1.0 million as part of an At-the-Market (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 $4.5 million before issuance costs of approximately $206,000 from the sale of 2.0 million shares of our common stock.

During the nine months ended September 30, 2016, we received gross proceeds of $845,000 as part of an ATM agreement we entered into with Meyers Associates, L.P. in May 2015. 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 September 30, 2016, we have received aggregate gross proceeds of approximately $3.1 million before issuance costs of approximately $109,000 from the sale of 1.2 million shares of common stock.

During the six months ended June 30, 2015, we received $3.3 million from the exercise of warrants to purchase 1.5 million shares of common stock, which warrants were issued in connection with earlier financing transactions.