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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended									9 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Net tax benefit	$ (3,386,000)	$ (6,723,000)	$ (1,610,000)	$ (2,249,000)	$ (1,852,000)	$ (9,094,000)	$ (1,484,000)	$ (1,831,000)			$ (13,968,000)	$ (14,261,000)	$ (12,208,000)
Federal corporate tax rate				35.00%						21.00%	24.50%	35.00%	35.00%
Non-cash adjustment to income tax expense											$ 805,000
Reduction in income tax provision									$ 1,100,000
Deferred tax asset	3,900,000									$ 3,900,000	3,900,000
Decrease in uncertain tax positions												$ 264,000
Effective tax rate impact on prior year tax position												177,000
Unrecognized tax benefits	0				0				$ 254,000	0	0	0	$ 254,000
Interest and penalties											0	0
Domestic Country
Income Taxes [Line Items]
Net operating loss (NOL) carryforwards	$ 83,500,000				0					$ 83,500,000	$ 83,500,000	$ 0
Minimum [Member] | State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards expiration year											2029
Maximum [Member] | State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards expiration year											2032
British Virgin Islands [Member]
Income Taxes [Line Items]
Net tax benefit					$ 1,800,000

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Income taxes.

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