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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, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 shares	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares
Summary of Significant Accounting Policies [Abstract]
Right-of-use lease asset			$ 1,215		$ 1,215			$ 1,264
Deferred rent obligation							$ 120
Cash and cash equivalents			23,130		23,130			11,885
Lease liability			$ 1,063		$ 1,063		$ 1,500	$ 1,191
Reverse stock split ratio	0.05
Common stock, par value (in dollars per share) | $ / shares	$ 0.001		$ 0.001		$ 0.001			$ 0.001
Weighted average common shares outstanding (in shares) | shares	859,998	17,199,974	4,863,984	859,998	3,197,508	801,282
Reverse stock split, Number of fractional shares cancelled | shares	14
Reverse stock split, fractional shares issued | shares	0
Tax on other comprehensive income (loss)					$ 0
Reclassifications out of other comprehensive income (loss)			$ 0	$ 0
Lease, practical expedients package					true

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