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Net Loss Per Share | 12 Months Ended
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Dec. 31, 2019
Net Loss per Share [Abstract] |
Net Loss Per Common Share | 14. Net Loss Per Share Basic and diluted net loss per share attributable to common stockholders was calculated as follows:
|  | Years ended December 31,
|  | 2018 |  | 2019
Numerator: |  |  |  |  |  |
Net loss |  | $ | (7,288) |  | $ | (7,830)
Dividend on convertible exchangeable preferred shares |  | $ | (201) |  | $ | (201)
Beneficial conversion feature of Series A convertible stock |  | $ | — |  | $ | —
Conversion of Series A convertible preferred stock |  | $ | — |  | $ | —
Net loss attributable to common shareholders |  | $ | (7,489) |  | $ | (8,031)
Denominator: |  |  |  |  |  |
Weighted-average number of common shares used in loss per share – basic and diluted |  |  | 12,094,131 |  |  | 16,321,746
Loss per share – basic and diluted |  | $ | (0.62) |  | $ | (0.49)
Potential dilutive securities have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:
|  | December 31, |  | December 31,
|  | 2018 |  | 2019
Stock options |  | 831,611 |  | 2,005,561
Convertible preferred stock |  | 1,698 |  | 1,698
Series A preferred stock |  | 132,000 |  | 132,000
Common stock warrants |  | 7,490,500 |  | 7,490,500
Total shares excluded from calculation |  | 8,455,809 |  | 9,629,759

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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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