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Stockholders' Equity, Preferred and Common Stock (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock [Abstract] |  |  |
Common stock, shares authorized to issue (in shares) | 300,000,000 | 300,000,000 |
Common stock, shares issued (in shares) | 137,928,828 | 124,976,373 |
Common stock, shares outstanding (in shares) | 137,928,828 | 124,976,373 |
Net proceeds from stock option exercises, vesting of restricted stock units, and ESPP purchases | $ 27,900 | $ 22,931 | $ 13,417
Preferred Stock [Member] |  |  |
Preferred Stock [Abstract] |  |  |
Preferred stock, shares authorized (in shares) | 15,000,000 |  |
Preferred stock, shares outstanding (in shares) | 0 |  |
Series C Junior Participating Preferred Stock [Member] |  |  |
Preferred Stock [Abstract] |  |  |
Preferred stock, shares issued (in shares) | 0 |  |
Preferred stock, shares outstanding (in shares) | 0 |  |
Common Stock [Member] |  |  |
Common Stock [Abstract] |  |  |
Common stock, shares authorized to issue (in shares) | 300,000,000 | 300,000,000 |
Common stock, shares issued (in shares) | 137,928,828 | 124,976,373 |
Common stock, shares outstanding (in shares) | 137,928,828 | 124,976,373 |
Common shares reserved for future issuance (in shares) | 14,839,373 |  |
Number of shares issued for stock option exercises, vesting of restricted stock units, and ESPP purchases (in shares) | 1,451,000 | 1,709,000 | 1,285,000
Net proceeds from stock option exercises, vesting of restricted stock units, and ESPP purchases | $ 27,900 | $ 22,900 | $ 13,700

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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