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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |
Percentage of valuation allowance against deferred tax assets | 100.00% |
Decrease in deferred tax assets valuation allowance | $ 5,400,000 | $ 1,100,000
U.S. corporate income tax rate | 21.00% | 34.00%
Provisional income tax due to reduction in deferred tax assets |  | $ 143,500
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 | $ 157,200,000 |
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 | $ 141,500,000 |
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, 2018 |
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 230,000,000 | 211,300,000
Operating loss carryforwards, annual limitation | 27,500 |
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income | 208,100,000 |
Operating loss carryforwards available for offset future taxable income | 21,900,000 |
Operating loss carryforwards for unlimited period | 20,200,000 |
Federal [Member] | Expire Between 2019 and 2037 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards available for offset future taxable income | $ 1,700,000 |
Federal [Member] | Earliest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards, expiration dates | 2019 |
Federal [Member] | Latest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards, expiration dates | 2037 |
Federal [Member] | Research and Development Tax Credit Carryforwards [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | $ 5,000,000 | 4,300,000
Tax credit carryforwards, expiration dates | 2038 |
Tax credit carryforwards expected to expire unutilized | $ 200,000 |
State and City [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 10,100,000 | 10,100,000
Operating loss carryforwards, expiration dates | 2038 |
Foreign [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 25,200,000 | 25,000,000
Federal and State [Member] | Earliest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Open tax period | Dec. 31, 2015 |
Federal and State [Member] | Latest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Open tax period | Dec. 31, 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] |  |
U.S. corporate income tax rate |  | 35.00%
Maximum [Member] | State and City [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 167,300,000 | $ 150,300,000

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