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Stockholders' Equity - Inducement Plan - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
OUTSTANDING OPTIONS
Outstanding at beginning of period	100,600
Options forfeited	(24,508)
Outstanding at end of period			100,600
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding at beginning of period	$ 3.09
Options forfeited	$ 2.06
Outstanding at end of period			$ 3.09
ADDITIONAL DISCLOSURES
Weighted-average contractual term (years) exercisable	1 year 7 months 6 days		9 years 6 months
Outstanding options exercisable at end of period	11,967
Aggregate intrinsic value (in thousands) exercisable at end of period	$ 3
Inducement Plan
OUTSTANDING OPTIONS
Options exercised	0	0
Outstanding at end of period	76,092
WEIGHTED-AVERAGE EXERCISE PRICE
Outstanding at end of period	$ 3.42
VESTED AND EXPECTED TO VEST
Outstanding options	76,092
Weighted-Average Exercise Price	$ 3.42
Aggregate Intrinsic Value (in thousands)	$ 4
Shares vested	0	0
Options exercised	0	0
ADDITIONAL DISCLOSURES
Weighted-average contractual term (years) exercisable	8 years 1 month 6 days
Weighted-average contractual term outstanding	8 years 1 month 6 days
Aggregate intrinsic value (in thousands) exercisable at end of period	$ 4
Fair value of shares vested	$ 17,591

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