Stock Options - Summary of Company's stock Options Activity (Details) - USD ($)		12 Months Ended
Jan. 30, 2018	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at the beginning of the period		1,028,500
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	2,800	2,800
Exercised		(156,300)
Forfeited / Expired		(71,000)
Outstanding at the end of the period		804,000
Vested and expected to vest at the end of the period		804,000
Exercisable at the end of the period		804,000
Outstanding at the beginning of the period		$ 4.98
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price		2.37
Share-based compensation arrangements by share-based payment award, options, exercises in period, weighted average exercise price		4.93
Forfeited / Expired		4.98
Outstanding at the end of the period		4.98
Vested and expected to vest at the end of the period		4.98
Exercisable at the end of the period		$ 4.98
Outstanding at the beginning of the period		$ 2,982,650
Outstanding at the end of the period		1,575,840
Vested and expected to vest at the end of the period		1,575,840
Exercisable at the end of the period		$ 1,575,840

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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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-SubTopic 10
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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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Number of share options (or share units) exercised during the current period.

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