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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share |
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Basic and diluted net loss per share (in thousands, except per share amounts): |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (95,154 | ) |  | $ | (112,444 | ) |  | $ | (106,794 | )
Denominator for basic and diluted net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 52,613 |  |  |  | 38,506 |  |  |  | 32,881 |
Basic and diluted net loss per share |  | $ | (1.81 | ) |  | $ | (2.92 | ) |  | $ | (3.25 | )
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Stock options and stock awards |  |  | 5,981 |  |  |  | 4,673 |  |  |  | 3,086 |
Total |  |  | 5,981 |  |  |  | 4,673 |  |  |  | 3,086 |

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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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