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Equity Incentive Plans - Summary of Non-vested Stock Option Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of the activity of stock option awards, shares |  |  |
Options non-vested, beginning balance (in shares) | 781 |  |
Options granted (in shares) | 480 |  |
Vested (in shares) | (242) |  |
Forfeited (in shares) | (119) |  |
Options non-vested, ending balance (in shares) | 900 | 781 |
Options non vested, Wtd. avg. grant date fair value beginning balance (in dollars per share) | $ 3.99 |  |
Granted, Wtd. Avg. grant date fair value (in dollars per share) | 1.59 | $ 3.64 | $ 5.91
Vested, Wtd. Avg. grant date fair value (in dollars per share) | 3.79 |  |
Forfeited, Wtd. Avg. grant date fair value (in dollars per share) | 3.40 |  |
Options non vested, Wtd. avg. grant date fair value ending balance (in dollars per share) | $ 2.87 | $ 3.99 |

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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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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