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Investments - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Cash and cash equivalents | $ 62,510,000 | $ 14,482,000 | $ 6,818,000 | $ 10,761,000
Investments | 30,053,000 |  |  |
Held-to-Maturity Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Investments | $ 30,100,000 | 0 |  |
Investment maturity | One year or less |  |  |
Money Market Funds [Member] | Level 1 [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Cash and cash equivalents | $ 55,600,000 | $ 0.0 |  |

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