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Net Loss Per Share (Tables) | 6 Months Ended
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Jun. 30, 2016
Earnings Per Share [Abstract] |
Summary of Computation of Basic and Diluted Net Loss Per Share | The following table sets forth the computation of our basic and diluted net loss per share (in thousands, except per share data):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Basic and diluted net loss per share |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net loss | $ | (4,935 | ) |  | $ | (9,977 | ) |  | $ | (14,470 | ) |  | $ | (23,711 | )
Denominator: |  |  |  |  |  |  |
Weighted-average shares outstanding - basic | 64,861 |  |  | 61,945 |  |  | 64,584 |  |  | 61,690 |
Effect of dilutive potential common shares from stock options, stock awards and employee stock purchase plan | — |  |  | — |  |  | — |  |  | — |
Weighted-average shares outstanding - diluted | 64,861 |  |  | 61,945 |  |  | 64,584 |  |  | 61,690 |
Net loss per share: |  |  |  |  |  |  |
Basic and diluted | $ | (0.08 | ) |  | $ | (0.16 | ) |  | $ | (0.22 | ) |  | $ | (0.38 | )
Summary of Outstanding Shares of Common Stock Equivalents | The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Stock options, stock awards and employee stock purchase plan | 13,567 |  |  | 11,058 |  |  | 11,736 |  |  | 11,063 |
Common stock subject to repurchase | 28 |  |  | 90 |  |  | 28 |  |  | 90 |
| 13,595 |  |  | 11,148 |  |  | 11,764 |  |  | 11,153 |

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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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