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A summary of stock option activity under the 2011 Long-Term Incentive Plan as of June 30, 2021, and changes during the six months ended June 30, 2021, are presented below: (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
Equity [Abstract]
Outstanding at beginning of period | shares	440,400
Outstanding at beginning of period | $ / shares	$ 6.58
Outstanding at beginning of period	5 years 9 months 18 days
Outstanding at beginning of period | $	$ 155
Granted | shares	236,667
Granted | $ / shares	$ 3.31
Exercised | shares
Exercised | $ / shares
Forfeited | shares	(3,400)
Forfeited | $ / shares	$ 12.00
Outstanding at end of period | shares	673,667
Outstanding at end of period | $ / shares	$ 5.41
Outstanding at end of period	6 years 10 months 24 days
Outstanding at end of period | $	$ 542
Exercisable at end of period | shares	437,000
Exercisable at end of period | $ / shares	$ 6.54
Exercisable at the end of period	5 years 4 months 24 days
Exercisable at end of period | $	$ 220

X

- Definition

Weighted average remaining contractual term for option awards outstanding at the end of the period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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