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NET INCOME (LOSS) PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of computation of basic and diluted loss per share | The following table sets forth the computation of basic and diluted net income (loss) per share for the three and six months ended June 30, 2018 and 2017 (in thousands, except per share amounts):
| Three Months Ended June 30, |  | Six Months Ended June 30,
2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 2,564 |  |  | $ | (19,743 | ) |  | $ | (8,116 | ) |  | $ | (39,609 | )
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 40,796 |  |  | 40,160 |  |  | 40,751 |  |  | 39,079 |
Computation of diluted securities: |  |  |  |  |  |  |
Dilutive effect of stock options | 807 |  |  | — |  |  | — |  |  | — |
Dilutive effect of RSUs | 87 |  |  | — |  |  | — |  |  | — |
Dilutive effect of ESPP purchase options | 4 |  |  | — |  |  | — |  |  | — |
Weighted average common shares outstanding—diluted | 41,694 |  |  | 40,160 |  |  | 40,751 |  |  | 39,079 |
Net loss per share: |  |  |  |  |  |  |
Basic and diluted net income (loss) per common share | $ | 0.06 |  |  | $ | (0.49 | ) |  | $ | (0.20 | ) |  | $ | (1.01 | )
Schedule of potential dilutive effect of the securities excluded from the calculation of diluted loss per share | The following outstanding stock options, RSUs, conversion premiums on the Company’s convertible senior notes and ESPP purchase options are antidilutive in the periods presented (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average number of stock options | 3,918 |  |  | 5,092 |  |  | 5,094 |  |  | 5,102 |
Weighted average number of RSUs | 367 |  |  | 375 |  |  | 483 |  |  | 364 |
Conversion premium on the 2019 Notes | — |  |  | 9 |  |  | — |  |  | 817 |
Weighted average ESPP purchase options | 5 |  |  | 36 |  |  | 33 |  |  | 37 |
Total | 4,290 |  |  | 5,512 |  |  | 5,610 |  |  | 6,320 |

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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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