Discontinued Operations - Additional Information (Detail)	3 Months Ended	6 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($)	Sep. 30, 2018 Offering	Sep. 30, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash used from discontinued operations	$ 2,200,000		$ 3,400,000
EIS Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of product offerings acquired \| Offering		2
Gain (Loss) on disposal of discontinued operations before tax	$ 0		$ 0

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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