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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |
Income tax expense | $ 0 | $ 0 |
Percentage of valuation allowance against deferred tax assets | 100.00% |  |
Decrease in deferred tax assets valuation allowance | $ 3,400,000 | 5,400,000 |
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 | $ 169,400,000 |  |
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 | $ 153,700,000 |  |
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, 2019 |  |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 246,300,000 | 230,000,000 |
Operating loss carryforwards, annual limitation | 27,500 |  |
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income | 207,000,000 |  |
Operating loss carryforwards available for offset future taxable income | 39,300,000 |  |
Operating loss carryforwards for unlimited period | 37,600,000 |  |
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 | 2020 |  |
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 | $ 5,300,000 | 5,000,000 |
Tax credit carryforwards, expiration dates | 2039 |  |
Tax credit carryforwards expected to expire unutilized | $ 100,000 |  |
State and City [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 11,200,000 | 11,200,000 |
Operating loss carryforwards, expiration dates | 2039 |  |
Foreign [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 26,100,000 | 25,200,000 |
Federal and State [Member] | Earliest Tax Year [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Open tax period | Dec. 31, 2016 |  |
Federal and State [Member] | Latest Tax Year [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Open tax period | Dec. 31, 2019 |  |
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 | $ 180,600,000 | $ 167,300,000 |

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