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Stockholders’ Equity - Authorized, Issued, and Outstanding Shares of Convertible Preferred Stock (Details) - USD ($) shares in Thousands, $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Class of Stock [Line Items] |  |
Shares Authorized | 129,478 | 129,478
Shares Issued | 24,642 | 24,642
Shares Outstanding | 24,642 | 24,642
Aggregate Liquidation Preference | $ 148,454 | $ 148,454
Series C |  |
Class of Stock [Line Items] |  |
Shares Authorized | 22,862 | 22,862
Shares Issued | 4,572 | 4,572
Shares Outstanding | 4,572 | 4,572
Aggregate Liquidation Preference | $ 38,820 | $ 38,820
Series D |  |
Class of Stock [Line Items] |  |
Shares Authorized | 28,301 | 28,301
Shares Issued | 5,660 | 5,660
Shares Outstanding | 5,660 | 5,660
Aggregate Liquidation Preference | $ 25,980 | $ 25,980
Series E |  |
Class of Stock [Line Items] |  |
Shares Authorized | 11,839 | 11,839
Shares Issued | 2,348 | 2,348
Shares Outstanding | 2,348 | 2,348
Aggregate Liquidation Preference | $ 17,537 | $ 17,537
Series F |  |
Class of Stock [Line Items] |  |
Shares Authorized | 37,253 | 37,253
Shares Issued | 7,256 | 7,256
Shares Outstanding | 7,256 | 7,256
Aggregate Liquidation Preference | $ 37,334 | $ 37,334
Series G |  |
Class of Stock [Line Items] |  |
Shares Authorized | 29,223 | 29,223
Shares Issued | 4,805 | 4,805
Shares Outstanding | 4,805 | 4,805
Aggregate Liquidation Preference | $ 28,783 | $ 28,783

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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://www.xbrl.org/2003/role/presentationRef -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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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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