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Stock-based Compensation - Summary of Stock-based Compensation Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
2005 Plan |  |
Stock Option Activity |  |
Number of options outstanding, Beginning of period (in shares) | 100,000 |
Number of options outstanding, Granted (in shares) | 0 |
Number of options outstanding, Exercised (in shares) | (48,000) |
Number of options outstanding, Forfeited (in shares) | 0 |
Number of options outstanding, Expired (in shares) | 0 |
Number of options outstanding, Ending of period (in shares) | 52,000 | 100,000
Weighted Average Exercise Price |  |
Weighted average exercise price, Outstanding beginning (USD per share) | $ 5.77 |
Weighted average exercise price, Granted (USD per share) | 0 |
Weighted average exercise price, Exercised (USD per share) | 1.33 |
Weighted average exercise price, Forfeited (USD per share) | 0 |
Weighted average exercise price, Expired (USD per share) | 0 |
Weighted average exercise price, Outstanding ending (USD per share) | $ 6.37 | $ 5.77
Stock Option Additional Disclosures |  |
Number of options outstanding, Full vested and expected to vest (in shares) | 52,000 |
Number of options outstanding, Vested (in shares) | 52,000 |
Weighted average exercise price, Full vested and expected to vest (USD per share) | $ 6.37 |
Weighted average exercise price, Vested (USD per share) | $ 6.37 |
Aggregate intrinsic value, Outstanding | $ 333 | $ 195
Aggregate intrinsic value, Fully vested and expected to vest | 333 |
Aggregate intrinsic value, Vested | $ 333 |
2010 Plan |  |
Stock Option Activity |  |
Number of options outstanding, Beginning of period (in shares) | 220,000 |
Number of options outstanding, Granted (in shares) | 0 | 0
Number of options outstanding, Exercised (in shares) | (10,000) |
Number of options outstanding, Forfeited (in shares) | 0 |
Number of options outstanding, Expired (in shares) | 0 |
Number of options outstanding, Ending of period (in shares) | 210,000 | 220,000
Weighted Average Exercise Price |  |
Weighted average exercise price, Outstanding beginning (USD per share) | $ 7.75 |
Weighted average exercise price, Granted (USD per share) | 0 |
Weighted average exercise price, Exercised (USD per share) | 2.53 |
Weighted average exercise price, Forfeited (USD per share) | 0 |
Weighted average exercise price, Expired (USD per share) | 0 |
Weighted average exercise price, Outstanding ending (USD per share) | $ 8.00 | $ 7.75
Stock Option Additional Disclosures |  |
Number of options outstanding, Full vested and expected to vest (in shares) | 210,000 |
Number of options outstanding, Vested (in shares) | 210,000 |
Weighted average exercise price, Full vested and expected to vest (USD per share) | $ 8.00 |
Weighted average exercise price, Vested (USD per share) | $ 8.00 |
Aggregate intrinsic value, Outstanding | $ 1,000 | $ 52
Aggregate intrinsic value, Fully vested and expected to vest | 1,000 |
Aggregate intrinsic value, Vested | $ 1,000 |

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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