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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Percentage of vesting of share-based compensation awards.

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Number of new stock issued during the period.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Equity - SBC (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	May 17, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based compensation
Options granted (in shares)		591,261		14,596
Options outstanding (in shares)		466,431	12,938	14,596
Options exercised (in dollars per shares)		$ 2.87
Effect of November offering (in shares)	32,365,823
Treasury stock (in shares)		16,354	0
Class A Common Stock
Share-based compensation
Reserved for issuance (in shares)	5,118,080
Effect of November offering (in shares)		75,130
Class B Common Stock
Share-based compensation
Effect of November offering (in shares)	32,365,823
Options
Share-based compensation
Options granted (in shares)	591,261	0	0
Options outstanding (in shares)			12,938
Unrecognized compensation costs			$ 323
Expected period for recognizing unrecognized compensation expense			2 years 8 months 1 day
Options exercised (in dollars per shares)	$ 2.87
Options grant date fair value (in dollars per shares)	$ 12.04
Cash received from option exercises		$ 263
Tax benefit (expense) realized for the tax deductions from options exercised		$ 20
Options \| First vesting period
Share-based compensation
Vesting (as a percent)	25.00%
Options \| Second vesting period
Share-based compensation
Vesting (as a percent)	25.00%
Options \| Class A Common Stock
Share-based compensation
Options granted (in shares)	591,261
Solaris LLC
Share-based compensation
Effect of November offering (in shares)		0	0
Solaris LLC \| Options
Share-based compensation
Options granted (in shares)				14,596
Available for grant (in shares)			47,062