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Revenue Recognition- Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018
Deferred Revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenues (Short-term contract liability)	$ 2,128,000	$ 3,423,000
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact to revenues and operating income (loss)	890,000	(1,073,000)
Capitalized contract acquisition costs			$ 239,000
Capitalized contract cost, amortization	109,000	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	$ 6,497,000	$ 6,497,000
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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