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Summary of Significant Accounting Policies - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 151,600 | $ 141,189 | $ 150,036
Foreign currency translation | 401 | (3,257) | 5,593
Reclassification of stranded tax effects from tax reform |  | (26) |
Unrealized (gain) loss on investments before reclassification, net of tax |  | 12 | (32)
Reclassification adjustment for net losses realized in net income, net of tax |  | 129 |
Unrealized loss on interest rate swap, net of tax | (104) |  |
Ending Balance | 158,088 | 151,600 | 141,189
Net Unrealized Loss on Marketable Investments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (115) | (83)
Reclassification of stranded tax effects from tax reform |  | (26) |
Unrealized (gain) loss on investments before reclassification, net of tax |  | 12 | (32)
Reclassification adjustment for net losses realized in net income, net of tax |  | 129 |
Ending Balance |  |  | (115)
Net Unrealized Gain (Loss) on Interest Rate Swaps [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Unrealized loss on interest rate swap, net of tax | (104) |  |
Ending Balance | (104) |  |
Cumulative Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (5,154) | (1,897) | (7,490)
Foreign currency translation | 401 | (3,257) | 5,593
Ending Balance | (4,753) | (5,154) | (1,897)
Total Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (5,154) | (2,012) | (7,573)
Foreign currency translation | 401 | (3,257) | 5,593
Unrealized loss on interest rate swap, net of tax | (104) |  |
Ending Balance | $ (4,857) | $ (5,154) | $ (2,012)

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