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Stock-Based Compensation - Equity Incentive Plans (Details) - 2016 Plan - shares |  | 12 Months Ended
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Jan. 20, 2017 | Dec. 31, 2020 | Dec. 31, 2019
Stock-Based Compensation |  |  |
Annual increase (as percent of outstanding common stock) | 4.00% |  |
Number of options or stock awards available for grant under the Plan |  | 340,144 |
Common Stock |  |  |
Stock-Based Compensation |  |  |
Additional shares authorized (in shares) |  |  | 3,000,000
Restricted Stock Units (RSUs) |  |  |
Stock-Based Compensation |  |  |
Number of options issued under the plan |  | 92,500 | 181,000

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- Definition Represents the annual increase in shares authorized for issuance, effective January 1, 2018, as a percent. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares issued under share-based payment 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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