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Income Taxes - Additional Information (Detail) € in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2017 USD ($)	Dec. 31, 2016 EUR (€)
Income Taxes [Line Items]
Effective tax rate	330.90%		47.80%	(183.80%)	34.30%
Valuation allowance increase (decrease)	$ (6,611,000)	$ (9,200,000)
Income tax (benefit) provision	$ (6,691,000)		$ 1,059,000	$ (10,476,000)	$ 3,474,000
U.S. statutory tax rate	34.00%		34.00%	34.00%	34.00%
Latest Tax Year
Income Taxes [Line Items]
Net operating loss and business tax credit carry forwards expiration date						At various dates through December 2036
Domestic Tax Authority
Income Taxes [Line Items]
Business tax credits carry forwards						$ 1,745,000
State
Income Taxes [Line Items]
Business tax credits carry forwards						442,000
Intellectual Property
Income Taxes [Line Items]
Income tax (benefit) provision		$ (5,625,000)
ASU No. 2016-09 | U S Federal And State Jurisdiction
Income Taxes [Line Items]
Net operating loss carry forwards							$ 5,300,000
Increase in valuation allowance							5,300,000
Impact of adopting ASU 2016-09 on retained earnings							$ 0
United States
Income Taxes [Line Items]
Net operating loss carry forwards						48,550,000
Germany
Income Taxes [Line Items]
Net operating loss carry forwards						$ 2,407,000		€ 2,287

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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