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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Apr. 14, 2020 $ / shares shares	Apr. 13, 2020 shares	Sep. 30, 2021 USD ($) lease $ / shares shares	Sep. 30, 2020 shares	Sep. 30, 2021 USD ($) lease $ / shares shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares
Summary of Significant Accounting Policies [Abstract]
Cash and cash equivalents			$ 40,219		$ 40,219		$ 33,406
Reverse stock split ratio	0.05
Reverse stock split, Number of fractional shares cancelled | shares	14
Tax on other comprehensive income (loss)					0
Reclassifications out of other comprehensive income (loss)					$ 0	$ 0
Common stock, par value (in dollars per share) | $ / shares	$ 0.001		$ 0.001		$ 0.001		$ 0.001
Weighted-average number of common shares used in loss per share - basic and diluted (in shares) | shares	859,998	17,199,974	9,368,056	4,863,984	8,575,379	3,197,508
Number of leases | lease			1		1

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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