Debt - components and classification of debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt principal	$ 106,456	$ 106,456
Unamortized deferred issuance costs	(7,835)	(8,896)
Exit fee accretion	710	669
Unamortized original discount	(575)	(694)
Carrying value of debt	98,756	97,535
Current portion of related party debt	2,039	2,039
Debt, net of current portion	93,240	92,127
Related party debt, net of current portion	3,477	3,369
Carrying value of debt	98,756	97,535
Term loans under Credit Agreement [Member]
Debt Instrument [Line Items]
Debt principal	100,000	100,000
Exit fee accretion	710
Note With Former [Member]
Debt Instrument [Line Items]
Debt principal	6,117	6,117
Other [Member]
Debt Instrument [Line Items]
Debt principal	$ 339	$ 339

Debt instrument exit fee accretion.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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, after accumulated amortization, of debt discount.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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