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Stockholders' Equity - Restricted Stock and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock issued	612,950	156,184
Value of restricted stock issued	$ 878	$ 512
Weighted average estimated fair value of restricted stock issued	$ 1.59	$ 3.02
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting terms (years)	1 year
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting terms (years)	4 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock issued	458,245	246,383
Value of restricted stock issued	$ 729	$ 743
Vesting terms (years)	1 year

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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