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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax [Line Items] |  |  |
State income tax provision | $ 1,300,000 | $ 1,100,000 | $ 1,300,000
Federal R&D credit carryforwards | 26,300,000 |  |
Increase in valuation allowance of deferred tax assets | $ 33,500,000 |  |
Tax rate | 21.00% | 35.00% |
Unrecognized tax reserves recorded during period | $ 3,104,000 | $ 361,000 | 363,000
Interest and/or penalties accrued | 0 | 0 |
Tax cuts and jobs act provisional adjustment | 1,100,000 | 1,092,000 |
Interest and/or penalties | 0 | $ 0 | $ 0
Federal |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | $ 393,000,000 |  |
Remaining net operating loss carryforward, expiration year | 2026 |  |
Federal | Expiring in 2025 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | $ 17,000,000 |  |
State |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | $ 339,000,000 |  |
Remaining net operating loss carryforward, expiration year | 2025 |  |
Research and development credit carryforwards with no expiration date | $ 11,300,000 |  |
State | Expiring in 2024 |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carryforwards with no expiration date | 500,000 |  |
State | Expiring in 2024 | Maximum |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 100,000 |  |
Foreign |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 771,900,000 |  |
Net operating loss carryforwards with no expiration date | 3,400,000 |  |
Foreign | Operating Loss Carryforwards Expiring 2022 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 768,500,000 |  |
Expire in 2019 |  |  |
Income Tax [Line Items] |  |  |
Federal R&D credit carryforwards | $ 100,000 |  |

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