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Stockholders' Equity - Restricted Stock and Restricted Stock Units (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock |  |
Restricted Stock and Restricted Stock Units |  |
Number of shares issued (shares) | 156,184 | 123,564
Value of shares issued | $ 512,300 | $ 611,600
Weighted average estimated fair value | $ 3.28 | $ 4.95
Restricted Stock | Minimum |  |
Restricted Stock and Restricted Stock Units |  |
Vesting terms (in years) | 1 year |
Restricted Stock | Maximum |  |
Restricted Stock and Restricted Stock Units |  |
Vesting terms (in years) | 4 years |
Restricted Stock Units |  |
Restricted Stock and Restricted Stock Units |  |
Number of shares issued (shares) | 325,853 | 184,454
Value of shares issued | $ 863,000.0 | $ 908,600
Weighted average estimated fair value | $ 2.65 | $ 4.93
Vesting terms (in years) | 1 year |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(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 Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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