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Net Loss Per Common Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Net Loss Per Common Share | 8. NET LOSS PER COMMON SHARE Basic and diluted loss per common share were calculated as follows:
|  | THREE MONTHS ENDED SEPTEMBER 30, |  |  | NINE MONTHS ENDED SEPTEMBER 30, |
(in thousands except share and per share amounts) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net loss |  | $ | (10,196 | ) |  | $ | (7,155 | ) |  | $ | (34,598 | ) |  | $ | (15,929 | )
Weighted average number of common shares outstanding, basic and diluted |  |  | 27,527,770 |  |  |  | 22,142,148 |  |  |  | 24,011,862 |  |  |  | 15,772,918 |
Net loss per common share, basic and diluted |  | $ | (0.37 | ) |  | $ | (0.32 | ) |  | $ | (1.44 | ) |  | $ | (1.01 | )
The weighted average number of common shares outstanding diluted for the three and nine months ended September 30, 2021 excludes approximately 3.6 million stock options and unvested restricted common shares, which were not dilutive and not included in the computation of net loss per common share. The weighted average number of common shares outstanding diluted for the three and nine months ended September 30, 2020 excludes approximately 1.0 million unvested restricted common shares, which were not dilutive and not included in the computation of net loss per common share.

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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=124432515&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=124432515&loc=d3e3630-109257 + Details
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