Subsequent Events (Narrative) (Details) - USD ($) shares in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 08, 2020	Oct. 26, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Subsequent Events Narrative
Subsequent Event, Date	Oct. 08, 2020	Oct. 26, 2020
Subsequent Event, Description	On October 8, 2020, we filed a Certificate of Amendment (the "Certificate of Amendment") to our Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware to increase the authorized number of shares of our capital stock to 235,000,000 shares, consisting of (i) 210,000,000 shares of common stock, $.001 par value and (ii) 25,000,000 shares of preferred stock, $.001 par value. The Certificate of Amendment was effective upon the filing thereof with the Secretary of State of the State of Delaware. The results of the proposal to approve an amendment to our Amended and Restated Certificate of Incorporation to increase the authorized number of shares of Common Stock were as follows: 110,507,257 in favor, 4,892,245 against, and 316,093 abstaining.	Subsequent to September 30, 2020 and through October 26, 2020, we have issued 2.5 million shares and raised a total of $5.8 million under the Common Stock Purchase Agreement with Lincoln Park.
Number of shares of common stock issued		2.5
Cash received from stock sale, before issuance costs		$ 5,800,000	$ 602,000	$ 5,644,000	$ 8,948,000	$ 13,236,000