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EARNINGS PER SHARE | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE Diluted net loss per share is the same as basic net loss per share for the six months ended June 30, 2019 and 2020 because the effects of potentially dilutive items were anti-dilutive, given our net loss during these periods. The following securities as of June 30, 2019 and June 30, 2020 have been excluded from the calculation of diluted weighted-average common shares outstanding because the effect is anti-dilutive (in thousands):
| June 30,
| 2019 |  | 2020
Common stock options | 1,620 |  |  | 715 |
Common stock warrants | 868 |  |  | — |
Unvested restricted stock units | 1,846 |  |  | 2,627 |
Common stock issuable pursuant to the ESPP | 22 |  |  | 9 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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