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Revenue Recognition- Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 01, 2018
Deferred Revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenues (Short-term contract liability)	$ 253,000	$ 3,676,000
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact to revenues and operating income (loss)	3,945,000	2,872,000
Capitalized contract acquisition costs			$ 239,000
Capitalized contract cost, amortization	0	120,000
Impairment loss in relation to costs capitalized		0
ASU 2014-09 | Accrued Revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets	$ 10,787,000	$ 10,787,000
ASU 2014-09 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets			$ 8,555,000

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