Income Taxes - Additional Information (Detail) - USD ($)
|
12 Months Ended |
|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Income Taxes Disclosure [Line Items] |
|
|
|
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| Federal income tax rate |
34.00%
|
34.00%
|
34.00%
|
|
| Increase in valuation allowance |
$ 6,200,000
|
$ 3,700,000
|
|
|
| Unrecognized tax benefit would impact the effective tax rate |
2,600,000
|
|
|
|
| Unrecognized tax benefit |
5,252,000
|
2,431,000
|
$ 2,054,000
|
$ 2,196,000
|
| Accrued interest and penalties related to unrecognized tax benefits |
300,000
|
$ 0
|
$ 0
|
|
| Domestic Federal [Member] |
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| Income Taxes Disclosure [Line Items] |
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|
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| Net operating loss carryforwards |
$ 198,200,000
|
|
|
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| Operating loss carryforwards, expiration year |
2018
|
|
|
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| Tax credit carryforwards |
$ 3,900,000
|
|
|
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| Tax credit carryforwards, expiration year |
2021
|
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| Domestic State [Member] |
|
|
|
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| Income Taxes Disclosure [Line Items] |
|
|
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| Net operating loss carryforwards |
$ 102,100,000
|
|
|
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| Operating loss carryforwards, expiration year |
2017
|
|
|
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| Domestic State [Member] | California [Member] |
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| Income Taxes Disclosure [Line Items] |
|
|
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| Tax credit carryforwards |
$ 4,800,000
|
|
|
|
| Foreign [Member] |
|
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| Income Taxes Disclosure [Line Items] |
|
|
|
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| Net operating loss carryforwards |
$ 2,400,000
|
|
|
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| Statutes of limitation for income tax returns start year |
4 years
|
|
|
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| Statutes of limitation for income tax returns end year |
6 years
|
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