Stockholders' Equity - Summary of Company's Share Option Plans Activities (Details) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) $ / shares shares
Number of Shares
Share options outstanding at beginning of year (in shares) \| shares	188,213
Granted (in shares) \| shares	0
Exercised (in shares) \| shares	(74,625)
Forfeited/expired (in shares) \| shares	(19,088)
Share options outstanding at end of year (in shares) \| shares	94,500
Weighted Average Exercise Price
Share options outstanding at beginning of year, weighted average exercise price (usd per share)	$ 5.72
Granted, weighted average exercise price (usd per share)	0.00
Exercised, weighted average exercise price (usd per share)	5.71
Forfeited/expired, weighted average exercise price (usd per share)	8.43
Share options outstanding at end of year, weighted average exercise price (usd per share)	$ 5.19
Share options outstanding at end of year, weighted-average remaining contractual life	1 year 10 months 6 days
Share options outstanding at end of year \| $	$ 716
Exercise Price Range One
Number of Shares
Exercise Price, Lower Limit (usd per share)	$ 4.16
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Two
Number of Shares
Exercise Price, Lower Limit (usd per share)	4.35
Exercise Price, Upper Limit (usd pre share)	8.09
Exercise Price Range Three
Number of Shares
Exercise Price, Lower Limit (usd per share)	5.21
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Four
Number of Shares
Exercise Price, Lower Limit (usd per share)	4.16
Exercise Price, Upper Limit (usd pre share)	7.44
Exercise Price Range Five
Number of Shares
Exercise Price, Lower Limit (usd per share)	4.16
Exercise Price, Upper Limit (usd pre share)	$ 7.44

Weighted average price of options that were either forfeited or expired.

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

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

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

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