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Loss per Common Share - Summary of Potentially Dilutive Securities (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Outstanding stock option |  |  |  |
Anti-dilutive securities |  |  |  |
Potentially dilutive securities excluded from the computations of diluted weighted-average shares outstanding | 4,190,116 | 3,665,459 | 4,190,116 | 3,665,459
Warrants |  |  |  |
Anti-dilutive securities |  |  |  |
Potentially dilutive securities excluded from the computations of diluted weighted-average shares outstanding | 1,041,667 |  | 1,041,667 |
Unvested restricted stock |  |  |  |
Anti-dilutive securities |  |  |  |
Potentially dilutive securities excluded from the computations of diluted weighted-average shares outstanding |  | 12,072 |  | 12,072
Restricted stock units |  |  |  |
Anti-dilutive securities |  |  |  |
Potentially dilutive securities excluded from the computations of diluted weighted-average shares outstanding | 892,237 | 522,190 | 892,237 | 522,190
Performance share units |  |  |  |
Anti-dilutive securities |  |  |  |
Potentially dilutive securities excluded from the computations of diluted weighted-average shares outstanding | 99,400 |  | 99,400 |

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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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