Income Taxes - Additional Information (Detail)
|
12 Months Ended |
|
Dec. 31, 2016
USD ($)
|
|---|
| Income Taxes [Line Items] |
|
| Income tax paid |
$ 0
|
| U.S. Federal [Member] |
|
| Income Taxes [Line Items] |
|
| Net operating loss carryforwards |
113,080,000
|
| Research and development tax credit |
5,842,000
|
| Foreign [Member] |
|
| Income Taxes [Line Items] |
|
| Net operating loss carryforwards |
14,863,000
|
| Research and development tax credit |
175,000
|
| State and City [Member] |
|
| Income Taxes [Line Items] |
|
| Net operating loss carryforwards |
$ 57,881,000
|
| Earliest Tax Year [Member] | U.S. Federal [Member] |
|
| Income Taxes [Line Items] |
|
| Operating loss carryforwards, expiration year |
2020
|
| Tax credit carryforwards, expiration year |
2020
|
| Earliest Tax Year [Member] | Foreign [Member] |
|
| Income Taxes [Line Items] |
|
| Operating loss carryforwards, expiration year |
2017
|
| Tax credit carryforwards, expiration year |
2036
|
| Earliest Tax Year [Member] | State and City [Member] |
|
| Income Taxes [Line Items] |
|
| Operating loss carryforwards, expiration year |
2017
|
| Latest Tax Year [Member] | U.S. Federal [Member] |
|
| Income Taxes [Line Items] |
|
| Operating loss carryforwards, expiration year |
2036
|
| Tax credit carryforwards, expiration year |
2017
|
| Latest Tax Year [Member] | Foreign [Member] |
|
| Income Taxes [Line Items] |
|
| Operating loss carryforwards, expiration year |
2021
|
| Tax credit carryforwards, expiration year |
2021
|
| Latest Tax Year [Member] | State and City [Member] |
|
| Income Taxes [Line Items] |
|
| Operating loss carryforwards, expiration year |
2036
|
| Not Subject To Annual Limitations [Member] | U.S. Federal [Member] |
|
| Income Taxes [Line Items] |
|
| Net operating loss carryforwards |
$ 76,420,000
|
| Research and development tax credit |
5,842,000
|
| Not Subject To Annual Limitations [Member] | State and City [Member] |
|
| Income Taxes [Line Items] |
|
| Net operating loss carryforwards |
$ 56,919,000
|