Summary of Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Note payable to principal stockholder - net carrying amount	$ 79,666	$ 49,521
Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount	60,000	75,000
Unamortized debt discount	(2,058)	(3,661)
Net carrying amount	57,942	71,339
5.75% Senior convertible notes due August 15, 2018
Debt Instrument [Line Items]
Principal amount	27,690	27,690
Unamortized premium	244	426
Unaccreted debt issuance costs	(277)	(481)
Net carrying amount	$ 27,657	$ 27,635

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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The amount for notes payable (written promise to pay), payable to related parties, which are due after one year (or one business cycle).

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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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