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Net Loss per Share Attributable to Common Stockholders | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Net Loss per Share Attributable to Common Stockholders |
15. | Net Loss per Share Attributable to Common Stockholders
The following table sets forth the computation of the basic and diluted net loss per common share during the years ended December 31, 2018 and 2017 (in thousands, except share and per share data):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Net loss attributable to common stockholders |  | $ | (30,055 | ) |  | $ | (25,512 | )
Weighted-average number of shares used in computing net loss per share, basic and diluted |  |  | 11,213,884 |  |  |  | 3,423,901 |
Net loss per share, basic and diluted |  | $ | (2.68 | ) |  | $ | (7.45 | )
Since the Company was in a loss position for all periods presented, diluted net loss per share is the same as basic net loss per share for all periods as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities on an as-if converted basis that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Options to purchase common stock |  |  | 1,361,977 |  |  |  | 821,741 |
Convertible preferred stock (1) |  |  | — |  |  |  | 736,000 |
Common stock warrants |  |  | 10,194 |  |  |  | 1,751,708 |
Redeemable convertible notes |  |  | — |  |  |  | 36,883 |
Total |  |  | 1,372,171 |  |  |  | 3,346,332 |
(1) | As of December 31, 2017, represents 3,680 shares of Series A Preferred Stock on an as converted basis to 0.7 million shares of common stock.

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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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