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Stock-Based Compensation - Restricted Stock Awards, Restricted Stock Units and Common Stock Awards (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Restricted stock awards |  |
Number of Restricted Stock Unit Awards |  |
Nonvested restricted shares outstanding, beginning balance (in shares) | 0 |
Granted (in shares) | 0 | 0
Nonvested restricted shares outstanding, ending balance (in shares) | 0 | 0
Additional disclosures |  |
Annual increment period | 3 years |
Unrecognized compensation cost | $ 0 | $ 0
Aggregate vesting date fair value of restricted awards | $ 0 | $ 255,000
Restricted stock awards | Minimum |  |
Additional disclosures |  |
Vesting period | 1 year |
Restricted stock awards | Maximum |  |
Additional disclosures |  |
Vesting period | 3 years |
Restricted stock units |  |
Number of Restricted Stock Unit Awards |  |
Nonvested restricted shares outstanding, beginning balance (in shares) | 410,100 |
Vested (in shares) | (236,100) |
Nonvested restricted shares outstanding, ending balance (in shares) | 174,000 | 410,100
Weighted Average Grant-Date Fair Value |  |
Nonvested restricted shares outstanding, beginning balance (in dollars per share) | $ 5.55 |
Vested (in dollars per share) | 4.41 |
Nonvested restricted shares outstanding, ending balance (in dollars per share) | $ 7.10 | $ 5.55
Additional disclosures |  |
Annual increment period | 3 years |
Unrecognized compensation cost | $ 168,000 |
Period over which unrecognized compensation expense is expected to be recognized | 4 months 28 days |
Aggregate vesting date fair value of restricted awards | $ 360,000 | $ 710,000
Restricted stock units | Minimum |  |
Additional disclosures |  |
Vesting period | 1 year |
Restricted stock units | Maximum |  |
Additional disclosures |  |
Vesting period | 3 years |
Common stock awards |  |
Number of Restricted Stock Unit Awards |  |
Granted (in shares) |  | 119,556
Weighted Average Grant-Date Fair Value |  |
Granted (in dollars per share) |  | $ 2.48

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- Definition The aggregate vesting date fair value of awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan.) + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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