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Net loss per share | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Net loss per share | Net loss per share Earnings per share are calculated in accordance with ASC Topic 260: "Earnings per Share", which specifies the computation, presentation and disclosure requirements for earnings per share (EPS). It requires the presentation of basic and diluted EPS. Basic EPS excludes all dilution and is based upon the weighted average number of shares of common stock outstanding during the period. Diluted EPS reflects the potential dilution that would occur if convertible securities or other contracts to issue common stock were exercised. For the six months ended June 30, 2020, there were 928,000 anti-dilutive stock options outstanding compared to 469,000 as of June 30, 2019. The potential dilutive effect of the 2024 Notes and the 2026 Notes conversion features (See Note 8 - Debt) were excluded from diluted net loss per share as of June 30, 2020 and June 30, 2019. Potential shares from the 2024 Notes and the 2026 Notes conversion features at their respective initial conversion prices of $28.55 per share and $42.97 per share are approximately 481,548 and 2,792,664, respectively. The following is a reconciliation of the weighted average of shares of common stock outstanding for the basic and diluted EPS computations:
(in thousands, except per share data) | Three Months Ended June 30, |  |  |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  |  |  | 2020 |  | 2019
Net loss | $ | (8,976) |  |  | $ | (1,109) |  |  |  |  | $ | (19,886) |  |  | $ | (3,838) |
Basic: |  |  |  |  |  |  |  |  |
Shares outstanding at beginning of period | 18,244 |  |  | 16,044 |  |  |  |  | 16,629 |  |  | 16,041 |
Weighted average shares issued during the period, net | — |  |  | 246 |  |  |  |  | 1,463 |  |  | 44 |
Weighted average common shares, basic | 18,244 |  |  | 16,290 |  |  |  |  | 18,092 |  |  | 16,085 |
Net loss per common share, basic | $ | (0.49) |  |  | $ | (0.07) |  |  |  |  | $ | (1.10) |  |  | $ | (0.24) |
Diluted: |  |  |  |  |  |  |  |  |
Weighted average common shares, basic | 18,244 |  |  | 16,290 |  |  |  |  | 18,092 |  |  | 16,085 |
Weighted average common shares, diluted | 18,244 |  |  | 16,290 |  |  |  |  | 18,092 |  |  | 16,085 |
Net loss per common share, diluted | $ | (0.49) |  |  | $ | (0.07) |  |  |  |  | $ | (1.10) |  |  | $ | (0.24) |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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