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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |
Income tax provision | $ 0 | $ 0
Tax benefit related to the exercise of non qualified stock options | $ 1,000,000 |
Percentage of valuation allowance against deferred tax assets | 100.00% |
Valuation allowance increase (decrease) | $ (76,600,000) | 2,600,000
Unrecognized tax benefits, interest or penalties accrued | $ 0 |
Tax Year 2013 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Open tax period | Dec. 31, 2013 |
Latest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Open tax period | Dec. 31, 2016 |
Foreign [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 21,100,000 | 22,100,000
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 209,300,000 | 184,500,000
Operating loss carryforwards, amount subject to limitations | 201,000,000 |
Operating loss carryforwards, annual limitation | 72,500 |
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income | 205,700,000 |
Federal [Member] | Research and Development Tax Credit Carryforwards [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | $ 4,000,000 | 3,800,000
Tax credit carryforwards, expiration dates | 2036 |
Federal [Member] | Expire Between 2018 and 2036 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 3,600,000 |
State and City [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 2,800,000 | 2,700,000
Operating loss carryforwards, expiration dates | 2036 |
Minimum [Member] | State and City [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 27,300,000 | 27,300,000
Maximum [Member] | State and City [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 153,000,000 | $ 109,700,000
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 | 150,200,000 |
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 | 130,500,000 |
ASU 2016-09 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Income tax benefit cumulative adjustment to retained earnings | 1,000,000 |
Valuation allowance offset against retained earnings | $ 1,000,000 |

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