Common stock issued in exchange.

No definition available.

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- Definition

Number of classes of common stock.

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- Definition

Stockholders' Equity, Conversion Ratio

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No definition available.

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- Definition

Stockholders' Equity Note, Stock Recapitalization, Conversion Ratio

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- Definition

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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No definition available.

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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.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

Per share or per unit amount of equity securities issued.

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No definition available.

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- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Number of shares of common and preferred stock retired from treasury during the period.

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Common Stock (Details) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
Common Stock (Details) $ / shares in Units, $ in Thousands	Jul. 01, 2017 shares	May 09, 2017 USD ($) class_of_stock shares	Oct. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Sep. 05, 2017 shares
Capital Unit [Line Items]
Cash from sale of stock \| $				$ 0	$ 39,438
Stock issuance costs \| $					$ 2,200
Bold Contribution Agreement
Capital Unit [Line Items]
Number of classes of common stock \| class_of_stock		2
Member Units \| Bold Contribution Agreement
Capital Unit [Line Items]
Conversion ratio				1
Class A Common Stock
Capital Unit [Line Items]
Common stock, shares issued				28,696,321	27,584,638
Common stock, shares outstanding				28,696,321	27,584,638
Common stock issued \| $				$ 29	$ 28
Class A Common Stock \| Stock Offering
Capital Unit [Line Items]
Common stock shares issued upon completion of public offering			4,500,000
Shares issued, price per share \| $ / shares			$ 9.25
Cash from sale of stock \| $			$ 39,400
Stock issuance costs \| $			$ 2,200
Class A Common Stock \| Bold Contribution Agreement
Capital Unit [Line Items]
Stock recapitalization, conversion ratio		1
Common stock, shares issued		150,000
Common stock issued \| $		$ 2,000
Conversion ratio		1		1
Class A Common Stock \| 2014 Plan
Capital Unit [Line Items]
Common stock shares issued upon completion of public offering				681,585	703,214
Treasury shares acquired				169,893	61,055
Treasury stock, shares, retired	15,357
Class A Common Stock \| 2014 Plan \| Bold Contribution Agreement
Capital Unit [Line Items]
Shares of common stock issued in arrangement		150,000
Class B Common Stock
Capital Unit [Line Items]
Common stock, shares issued				35,452,178	36,052,169
Common stock, shares outstanding				35,452,178	36,052,169
Common stock issued \| $				$ 35	$ 36
Class B Common Stock converted to Class A Common Stock (shares)				599,991	18,659
Class B Common Stock \| Bold Contribution Agreement
Capital Unit [Line Items]
Cash from sale of stock \| $		$ 36
Conversion ratio		1
Shares of common stock issued in arrangement						36,070,828