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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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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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