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Stock-Based Compensation - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock Units |  |  |
Issued (in shares) | (37,500) | (77,500) |
Aggregate Intrinsic Value |  |  |
Vested (in shares) | 37,500 | 77,500 |
Restricted Stock Units |  |  |
Restricted Stock Units |  |  |
Vesting period | 5 years |  |
Restricted Stock Units |  |  |
Restricted stock units at the beginning of the period (in shares) | 37,000 | 120,000 |
Issued (in shares) | (37,000) | (78,000) |
Forfeited (in shares) |  | (5,000) |
Restricted stock units at the end of the period (in shares) | 0 | 37,000 | 120,000
Weighted-Average Grant Date Fair Value |  |  |
Restricted stock units at the beginning of the period (in dollars per share) | $ 5.23 | $ 3.97 |
Issued (in dollars per share) | 5.23 | 3.05 |
Forfeited (in dollars per share) |  | 8.81 |
Restricted stock units at the end of the period (in dollars per share) | $ 0.00 | $ 5.23 | $ 3.97
Weighted Average Remaining Contractual Life |  |  |
Restricted stock units | 0 years | 4 months 17 days | 8 months 12 days
Aggregate Intrinsic Value |  |  |
Restricted stock units |  | $ 178 | $ 252
Stock price | $ 9.00 | $ 4.75 | $ 2.10
Vested (in shares) | 37,000 | 78,000 |
Restricted Stock Units | Fourth anniversary of the grant date |  |  |
Restricted Stock Units |  |  |
Vesting (as a percent) | 50.00% |  |
Restricted Stock Units | Fifth anniversary of the grant date |  |  |
Restricted Stock Units |  |  |
Vesting (as a percent) | 50.00% |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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