Series C-1 Preferred Stock (Narrative) (Details) - USD ($)			1 Months Ended	12 Months Ended
	Dec. 20, 2018	Jan. 09, 2015	Oct. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Contingent liability
Series C-1 Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Common stock issued upon conversion of each convertible preferred stock				6,000,000
Aggregate proceeds from issuance of convertible prederred stock					$ 39,879,000
Series C-1 Convertible Preferred Stock remained outstanding				12,459	18,459
Stock Purchase Agreement [Member]
Class Of Stock [Line Items]
Shares sold at the market, shares	11,111,111	7,760,000
Number of shares purchased, price per share	$ 2.70
Stock Purchase Agreement [Member] | Certain Institutional Investors [Member] | Series C-1 Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Shares sold at the market, shares			18,459
Number of shares purchased, price per share			$ 2,167
Common stock issued upon conversion of each convertible preferred stock			1,000
Preferred Stock, Redemption Price Per Share			$ 2.167
Price per share premium to closing price percentage			10.00%
Aggregate proceeds from issuance of convertible prederred stock			$ 40,000,000
Net proceeds from issuance of convertible preferred stock			$ 39,900,000
Percentage of beneficial ownership limitation of common stock outstanding			9.99%
Notice period of increase beneficial ownership limitation			61 days
Convertible peferred stock, redemption description				If at any time while the C-1 Preferred Shares are outstanding, a) the Company effects any merger, consolidation, stock sale or other business combination (other than such a transaction in which the Company is the surviving or continuing entity and its common stock is not exchanged for or converted into other securities, cash or property), b) the Company effects any sale of all or substantially all of its assets in one transaction or a series of related transactions, c) any tender offer or exchange offer (whether by the Company or another person) is completed pursuant to which more than 50% of the common stock not held by the Company or is exchanged for or converted into other securities, cash or property, or d) the Company effects any reclassification of the common stock or any compulsory share exchange pursuant (other than as a result of a dividend, subdivision or combination covered above) to which the common stock is effectively converted into or exchanged for other securities, cash or property, (in any such case, a “Fundamental Transaction”) then, upon any subsequent conversion of the C-1 Preferred Shares, the holder shall have the right to receive, in lieu of the right to receive shares of common stock, for each share of common stock that would have been issued upon such conversion immediately prior to the occurrence of such Fundamental Transaction, the same kind and amount of securities, cash or property as it would have been entitled to receive upon the occurrence of such Fundamental Transaction if it had been, immediately prior to such Fundamental Transaction, the holder of the equivalent amount of common stock.
Stock Purchase Agreement [Member] | Certain Institutional Investors [Member] | Series C-1 Convertible Preferred Stock [Member] | Maximum [Member]
Class Of Stock [Line Items]
Percentage of beneficial ownership limitation of common stock outstanding			19.99%
Percentage of redemption of common stock included in tender offer				50.00%
Registration Payment Arrangement [Member]
Class Of Stock [Line Items]
Period to file registration statement, declared effective on SEC review				120 days
Penalty percentage for not meeting the registration agreement				1.00%
Penalty period				6 months
Contingent liability				$ 0
Registration payment arrangement, term				We were required to file a registration statement covering the resale of the full number of shares no later than 30 days after the closing of the agreement and must use commercially reasonable efforts to cause the registration statement to be declared effective no later than 90 days after the closing date (no review by the SEC) or in the event of a review by the SEC, 120 days after the closing date. We filed, and the SEC declared effective this registration statement during 2018.
Registration Payment Arrangement [Member] | Maximum [Member]
Class Of Stock [Line Items]
Period to file registration statement				30 days
Period to file registration statement, declared effective				90 days
Penalty percentage for not meeting the registration agreement				6.00%