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Net Income (Loss) Per Share - Additional Information (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net Income (Loss) Per Share [Line Items] |  |  |  |
Diluted weighted average common shares outstanding | 9,439,025 | 9,520,285 | 9,459,272 | 10,120,998
Warrant |  |  |  |
Net Income (Loss) Per Share [Line Items] |  |  |  |
Diluted weighted average common shares outstanding |  |  |  | 9,681
Options Outstanding |  |  |  |
Net Income (Loss) Per Share [Line Items] |  |  |  |
Diluted weighted average common shares outstanding |  |  |  | 670,949

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1505-109256 + Details
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