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Significant Accounting Policies - Net Income (Loss) Per Share (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share |  |  |  |
Weighted average shares outstanding used to compute basic earnings per share | 21,777 | 10,879 | 21,638 | 10,812
Incremental shares issuable upon the assumed exercise of stock options | 58 | 51 | 75 | 48
Unvested restricted stock and restricted stock units | 274 | 450 | 366 | 486
Shares used to compute diluted earnings per share | 22,109 | 11,380 | 22,079 | 11,346

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1500-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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