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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Basic and Diluted Net Loss Per Share | The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data).
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Net loss |  | $ | (8,969 | ) |  | $ | (11,860 | ) |  | $ | (25,838 | )
Weighted-average shares used in computing basic and diluted net loss per share |  | 54,946 |  |  | 52,342 |  |  | 50,141 |
Basic and diluted net loss per share |  | $ | (0.16 | ) |  | $ | (0.23 | ) |  | $ | (0.52 | )
Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share | The following securities were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive (in thousands).
|  | December 31,
|  | 2017 |  | 2016 |  | 2015
Stock options |  | 4,047 |  |  | 5,556 |  |  | 6,092 |
Restricted stock units |  | 2,033 |  |  | 2,019 |  |  | 1,818 |
ESPP |  | — |  |  | — |  |  | 156 |
Common stock warrants |  | 13 |  |  | 132 |  |  | 191 |
Total |  | 6,093 |  |  | 7,707 |  |  | 8,257 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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