The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Amount of the required periodic payments applied to interest.

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Gross amount of debt extinguished.

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

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Debt - Other Note Payable (Detail) - USD ($)				12 Months Ended
Debt - Other Note Payable (Detail) - USD ($)	Mar. 28, 2017	Feb. 14, 2017	May 03, 2016	Dec. 31, 2017	Dec. 31, 2016	May 23, 2013	Dec. 31, 2011
Debt Instrument [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount				$ 0	$ 17,934,000
Preferred Stock
Debt Instrument [Line Items]
Issuance of preferred stock upon conversion				2,750,000
Series A preferred stock \| Preferred Stock \| WCAS conversion
Debt Instrument [Line Items]
Number of shares issued upon conversion of debt, shares	250,000			250,000
Senior subordinated note
Debt Instrument [Line Items]
Debt interest rate, stated percentage						12.00%
Term loan \| Debt conversion CRG and WCAS
Debt Instrument [Line Items]
Principal balance converted		$ 27,500,000
Conversion rate (usd per share)	$ 10
Term loan \| WCAS conversion
Debt Instrument [Line Items]
Principal balance converted				$ 2,500,000
Restructured debt \| Common Stock
Debt Instrument [Line Items]
Issuance of preferred stock upon conversion			49,526
Restructured debt \| Series AB Preferred Stock
Debt Instrument [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount			$ 2,100,000
Number of shares issued upon conversion of debt, shares			1,660,530
Restructured debt \| Restructured WCAS Note \| WCAS Capital Partners IV, L.P.
Debt Instrument [Line Items]
Debt, face amount	$ 2,500,000						$ 5,000,000
Debt interest rate, stated percentage							10.00%
Debt extinguished			$ 700,000
Interest payments	$ 0
Restructured debt \| Payment-in-kind (PIK) interest \| WCAS Capital Partners IV, L.P.
Debt Instrument [Line Items]
Debt interest rate, stated percentage	10.00%