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Summary of Significant Accounting Policies - Net Loss Per Share (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net loss per share |  |  |
Potentially dilutive common shares not been included in net loss per common share calculations because the effect would have been anti-dilutive | 1,700,312 | 869,684 | 730,192
Stock options |  |  |
Net loss per share |  |  |
Potentially dilutive common shares not been included in net loss per common share calculations because the effect would have been anti-dilutive | 1,699,202 | 866,132 | 723,747
Restricted Stock |  |  |
Net loss per share |  |  |
Potentially dilutive common shares not been included in net loss per common share calculations because the effect would have been anti-dilutive | 1,110 | 3,552 | 6,445

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + 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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