Accrued interest of related party debt.

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Amount of leases renewed per month.

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Area of office space leased.

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Available loan balance cancelled.

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Debt instrument principal amounts cancelled.

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Lease expiration month year.

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Line of credit facility restricted borrowing capacity.

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Loan agreement with related party.

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Number of months advances outstanding.

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Office lease expense.

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Principal amount per share.

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Related party transaction debt instrument prepayment.

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Related party transaction prepayment period.

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Face amount or stated value per share of common stock.

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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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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt premium.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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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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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Related-Party Arrangements - Additional Information (Detail)				1 Months Ended			3 Months Ended		6 Months Ended
	Mar. 11, 2018 USD ($) $ / shares shares	Oct. 23, 2017 shares	Oct. 10, 2017 $ / shares shares	May 31, 2015 USD ($) ft²	Oct. 31, 2013 USD ($)	Oct. 31, 2007 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares shares
Related Party Transaction [Line Items]
Principal amount							$ 129,200,000		$ 129,200,000
Loss on extinguishment of debt							$ 772,000	$ (830,000)	$ (53,000)	$ (830,000)
Common stock, shares issued \| shares							145,619,293		145,619,293		119,053,414
Common stock, par value \| $ / shares							$ 0.01		$ 0.01		$ 0.01
Amount available for future borrowings							$ 0		$ 0		$ 0
Common Stock
Related Party Transaction [Line Items]
Number of shares sold in underwritten public offering \| shares		973,236
Charitable Foundation \| Common Stock \| Director
Related Party Transaction [Line Items]
Number of shares sold in underwritten public offering \| shares			166,600
Exchange price per share \| $ / shares			$ 6.00
The Mann Group LLC
Related Party Transaction [Line Items]
Loan agreement with related party					$ 370,000,000	$ 350,000,000
Loss on extinguishment of debt									800,000
Unamortized premium							800,000		800,000
Debt issuance costs							$ 100,000		100,000
The Mann Group LLC \| Amended Agreement
Related Party Transaction [Line Items]
Maturity date							Jan. 05, 2020
The Mann Group LLC \| Loan Arrangement
Related Party Transaction [Line Items]
Accrued interest of related party debt							$ 4,600,000	10,700,000	$ 4,600,000	10,700,000	2,300,000
Available amount of credit facility under covenant restrictions								19,400,000		19,400,000
Common stock, shares issued \| shares	3,000,000
Common stock, par value \| $ / shares	$ 2.72
Principal balance cancelled amount	$ 8,200,000
Fixed borrowing rate							5.84%		5.84%
Related party transaction prepayment period									90 days
Aggregate principal amount cancelled									$ 113,200,000
The Mann Group LLC \| Loan Arrangement \| Maximum
Related Party Transaction [Line Items]
Amount prepaid for cancellation of indebtedness									$ 200,000,000
The Mann Group LLC \| Loan Arrangement \| Minimum
Related Party Transaction [Line Items]
Number of months advances outstanding									12 months
The Mann Group LLC \| Amended and Restated Loan Arrangement
Related Party Transaction [Line Items]
Maturity date	Jul. 01, 2021
Principal amount	$ 71,500,000
No of convertible shares	250
Principal amount per share \| $ / shares	$ 1,000
Conversion price of shares \| $ / shares	$ 4.00
Related Party Debt
Related Party Transaction [Line Items]
Principal amount							$ 71,506,000		$ 71,506,000		$ 79,666,000
Unamortized premium							758,000		758,000
Debt issuance costs							$ 68,000		$ 68,000
Related Party Debt \| Letter Agreement
Related Party Transaction [Line Items]
Description of variable rate interest									the interest rate will increase to the one-year LIBOR calculated on the date of the initial advance or in effect on the date of default, whichever is greater, plus 5% per annum.
Related Party Debt \| Letter Agreement \| LIBOR
Related Party Transaction [Line Items]
Interest rate (LIBOR)									5.00%
Mann Foundation \| Sublease Agreement
Related Party Transaction [Line Items]
Area of office space leased \| ft²				12,500
Lease expiration period									2017-04
Amount of leases renewed per month				$ 20,000
Lease expiration date									Aug. 31, 2017
Lease payments								$ 60,000		$ 122,000