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Redeemable Convertible Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Nov. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  | 61,279,079 | 0 | 65,464,387 | 65,464,387
Temporary equity redemption terms, change in control threshold |  |  | 50.00% |  |  |
Dividends declared on the Preferred Stock |  |  | $ 0 |  |  |
Voting right protective provision, shares outstanding threshold |  |  | 15,100,000 |  |  |
Voting right protective provision, approval percentage |  |  | 50.00% |  |  |
Convertible preferred stock conversion terms, minimum threshold from initial public offering |  |  | $ 50,000 |  |  |
Conversion ratio |  |  | 100.00% |  |  |
Repurchase and retirement of redeemable convertible preferred stock (in shares) |  |  | 4,268,489 |  |  |
Repurchase of redeemable convertible preferred stock, price per share (in dollars per share) |  | $ 4.50 |  |  |  |
Repurchase of redeemable convertible preferred stock, consideration received |  |  | $ 19,200 |  |  |
Repurchase of redeemable convertible preferred stock, carrying value |  |  | 12,703 |  |  |
Repurchase of redeemable convertible preferred stock |  |  | 6,506 |  |  |
Additional Paid-in Capital |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Repurchase of redeemable convertible preferred stock |  |  | $ 6,506 |  |  |
Series A-1 |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  | 9,142,770 |  |  |
Dividends payable, amount per share (in dollars per share) |  |  | $ 0.80 |  |  |
Issue price per share (in dollars per share) |  |  | 10.00 |  |  |
Liquidation preference per share (in dollars per share) |  |  | $ 10 |  |  |
Repurchase and retirement of redeemable convertible preferred stock (in shares) |  | 874,069 |  |  |  |
Series A-2 |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  | 47,124,931 |  |  |
Dividends payable, amount per share (in dollars per share) |  |  | $ 0.000008 |  |  |
Issue price per share (in dollars per share) |  |  | 0.0001 |  |  |
Liquidation preference per share (in dollars per share) |  |  | $ 0.0001 |  |  |
Repurchase and retirement of redeemable convertible preferred stock (in shares) |  | 3,151,858 |  |  |  |
Series B-1 |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  | 4,866,360 |  |  |
Dividends payable, amount per share (in dollars per share) |  |  | $ 0.4568 |  |  |
Issue price per share (in dollars per share) |  |  | 5.71 |  |  |
Liquidation preference per share (in dollars per share) |  |  | $ 5.71 |  |  |
Repurchase and retirement of redeemable convertible preferred stock (in shares) |  | 242,562 |  |  |  |
Series B-2 |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  | 145,018 |  |  |
Dividends payable, amount per share (in dollars per share) |  |  | $ 0.4568 |  |  |
Issue price per share (in dollars per share) |  |  | 5.71 |  |  |
Liquidation preference per share (in dollars per share) |  |  | $ 5.71 |  |  |
IPO |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Number of shares issued in stock transaction | 7,840,908 |  |  |  |  |
Price per share of stock transaction (in dollars per share) | $ 15.00 |  |  |  |  |

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- Definition Convertible Preferred Stock, Terms Of Conversion, Minimum Threshold From Initial Public Offering + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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