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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Income tax provision |  |  |  | $ 0 | $ 0 | $ 0
Percentage of valuation allowance against deferred tax assets |  |  |  | 100.00% |  |
Decrease in deferred tax assets valuation allowance |  |  |  | $ (1,100,000) | (76,600,000) |
Reduction in corporate income tax rate | 21.00% |  |  | 34.00% |  |
Provisional income tax due to reduction in deferred tax assets | $ 143,500,000 |  |  | $ 143,500 |  |
Tax Cuts and Jobs Act, accounting complete | false |  |  |  |  |
Provisional amount of one-time transition tax | $ 0 |  |  |  |  |
Scenario, Plan [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Reduction in corporate income tax rate |  |  | 21.00% |  |  |
Earliest Tax Year [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Open tax period |  |  |  | Dec. 31, 1998 |  |
Latest Tax Year [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Open tax period |  |  |  | Dec. 31, 2017 |  |
Federal [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 211,300,000 | 209,300,000 | 184,500,000
Operating loss carryforwards, amount subject to limitations |  |  |  | 210,500,000 |  |
Operating loss carryforwards, annual limitation |  |  |  | 27,500 |  |
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income |  |  |  | 209,500,000 |  |
Federal [Member] | Expire Between 2018 And 2037 [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | 1,000,000 |  |
Federal [Member] | Tax Year 2013 [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Open tax period |  | Dec. 31, 2013 |  |  |  |
State and City [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 800,000 | 800,000 |
Operating loss carryforwards, expiration dates |  |  |  | 2037 |  |
Foreign [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 25,000,000 | 21,100,000 | 22,100,000
Federal and State [Member] | Earliest Tax Year [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Open tax period |  |  |  | Dec. 31, 2014 |  |
Federal and State [Member] | Latest Tax Year [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Open tax period |  |  |  | Dec. 31, 2017 |  |
Minimum [Member] | Federal [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards, expiration dates |  |  |  | 2018 |  |
Minimum [Member] | State and City [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 27,300,000 | 27,300,000 |
Maximum [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Reduction in corporate income tax rate |  |  |  | 35.00% |  |
Maximum [Member] | Federal [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards, expiration dates |  |  |  | 2037 |  |
Maximum [Member] | State and City [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 150,300,000 | 153,000,000 |
ASU 2016-16 [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Decrease in deferred tax assets valuation allowance | 834,000 |  |  |  |  |
Decrease in net operating loss deferred tax assets | $ 834,000 |  |  |  |  |
New York State [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income |  |  |  | 149,000,000 |  |
New York City [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income |  |  |  | 133,300,000 |  |
Research and Development Tax Credit Carryforwards [Member] | Federal [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax credit carryforwards |  |  |  | $ 4,300,000 | $ 4,000,000 | $ 3,800,000
Tax credit carryforwards, expiration dates tag |  |  |  | 2037 |  |

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