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Summary of Gross Carrying Amount and Accumulated Amortization for Intangible Assets Resulting from Acquisitions (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 25,596 | $ 23,939
Accumulated amortization | (13,599) | (12,959)
Intangible assets, net | $ 11,997 | 10,980
Trademarks |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Amortization period (in years) | 5 years |
Gross carrying amount | $ 758 | 600
Accumulated amortization | (114) | (77)
Intangible assets, net | 644 | 523
Developed Technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 9,093 | 8,300
Accumulated amortization | (4,201) | (3,978)
Intangible assets, net | $ 4,892 | 4,322
Developed Technology | Minimum |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Amortization period (in years) | 10 years |
Developed Technology | Maximum |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Amortization period (in years) | 12 years |
Customer Relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 15,745 | 15,039
Accumulated amortization | (9,284) | (8,904)
Intangible assets, net | $ 6,461 | $ 6,135
Customer Relationships | Minimum |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Amortization period (in years) | 4 years |
Customer Relationships | Maximum |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Amortization period (in years) | 12 years |

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