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Net Income (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations | The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share amounts):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |
Net loss | $ | (5,924 | ) |  | $ | (21,035 | ) |  | $ | (82,955 | )
Denominator: |  |  |  |  |
Weighted average number of shares outstanding: |  |  |  |  |
Basic and diluted | 89,575 |  |  | 85,615 |  |  | 80,974 |
Net loss per share: |  |  |  |  |
Basic and diluted | $ | (0.07 | ) |  | $ | (0.25 | ) |  | $ | (1.02 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following table sets forth the potential weighted common shares outstanding that were excluded from the computation of basic and diluted net loss per share calculations (in thousands):
| December 31,
| 2019 |  | 2018 |  | 2017
Convertible notes | 1,322 |  |  | — |  |  | — |
Stock options | 2,568 |  |  | 3,327 |  |  | 4,470 |
Restricted stock units | 2,955 |  |  | 2,997 |  |  | 3,059 |
Stock purchase rights under the ESPP | 478 |  |  | 609 |  |  | 620 |
Warrants (1) | 4,321 |  |  | 1,268 |  |  | 782 |
Total | 11,644 |  |  | 8,201 |  |  | 8,931 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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