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Net Loss per Share - Anti-Dilutive Awards Excluded from Calculation (Details) - shares |  | 12 Months Ended
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May 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share |  |  |  |
Common stock dividend declared, percentage of shares outstanding | 5.00% |  |  |
Weighted Average |  |  |  |
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share |  |  |  |
Weighted average number of securities excluded from calculation |  | 860,210 | 781,050 | 794,328
Stock options | Weighted Average |  |  |  |
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share |  |  |  |
Weighted average number of securities excluded from calculation |  | 240,700 | 355,264 | 432,337
Restricted stock units | Weighted Average |  |  |  |
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share |  |  |  |
Weighted average number of securities excluded from calculation |  | 552,458 | 348,826 | 281,875
Restricted stock awards | Weighted Average |  |  |  |
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share |  |  |  |
Weighted average number of securities excluded from calculation |  | 67,052 | 76,960 | 80,116

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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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