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Long-term debts, net - Schedule of Long-term Debts, Including Promissory Notes Payable to Certain Shareholders, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal amount	$ 65,688	$ 52,750
Less: unamortized debt issuance costs	4,269	4,348
Add: PIK interest accrued to the principal balance	1,429	1,611
Long-term debt, net	62,848	50,013
Less: Current portion of long-term debt	2,750	4,135
Long-term debt, net (non-current)	60,098	45,878
12% Term Loan, Due 2020 [Member]
Debt Instrument [Line Items]
Principal amount	41,203	42,750
Less: unamortized debt issuance costs	3,156	3,964
Add: PIK interest accrued to the principal balance	546	479
Long-term debt, net	38,593	39,265
Less: Current portion of long-term debt	2,062	4,135
Long-term debt, net (non-current)	36,531	35,130
12% Incremental Term Loan, Due 2020 [Member]
Debt Instrument [Line Items]
Principal amount	14,485
Less: unamortized debt issuance costs	783
Add: PIK interest accrued to the principal balance	10
Long-term debt, net	13,712
Less: Current portion of long-term debt	688
Long-term debt, net (non-current)	13,024
10% Promissory Notes, Due 2021 [Member]
Debt Instrument [Line Items]
Principal amount	10,000	10,000
Less: unamortized debt issuance costs	330	384
Add: PIK interest accrued to the principal balance	873	1,132
Long-term debt, net	10,543	10,748
Long-term debt, net (non-current)	$ 10,543	$ 10,748

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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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