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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The computation of basic and diluted EPS is as follows (in thousands, except per share amounts):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 20,292 |  |  | $ | 10,229 |  |  | $ | 48,705 |  |  | $ | 33,987 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding—basic |  |  | 42,721 |  |  |  | 40,700 |  |  |  | 42,178 |  |  |  | 39,977 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase common stock |  |  | 3,239 |  |  |  | 3,078 |  |  |  | 2,780 |  |  |  | 3,593 |
Employee stock purchase plan shares |  |  | 270 |  |  |  | 322 |  |  |  | 273 |  |  |  | 250 |
Restricted stock |  |  | 346 |  |  |  | 145 |  |  |  | 229 |  |  |  | 99 |
Weighted-average shares outstanding—diluted |  |  | 46,576 |  |  |  | 44,245 |  |  |  | 45,460 |  |  |  | 43,919 |
Basic EPS |  | $ | 0.47 |  |  | $ | 0.25 |  |  | $ | 1.15 |  |  | $ | 0.85 |
Diluted EPS |  | $ | 0.44 |  |  | $ | 0.23 |  |  | $ | 1.07 |  |  | $ | 0.77 |
Anti-dilutive equity awards under stock-based award plans excluded from the determination of diluted EPS |  |  | 167 |  |  |  | 899 |  |  |  | 167 |  |  |  | 899 |

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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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