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Summary of Significant Accounting Policies - Schedule of Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 141,189 | $ 150,036 | $ 127,302
Foreign currency translation before reclassification |  |  | (2,764)
Foreign currency translation | (3,257) | 5,593 | (2,764)
Reclassification of stranded tax effects from tax reform | (26) |  |
Unrealized (gain) loss on investments before reclassification, net of tax | 12 | (32) | 17
Reclassification adjustment for net losses realized in net income, net of tax | 129 |  |
Ending Balance | 151,600 | 141,189 | 150,036
Net Unrealized Gain (Loss) on Marketable Investments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (115) | (83) | (100)
Reclassification of stranded tax effects from tax reform | (26) |  |
Unrealized (gain) loss on investments before reclassification, net of tax | 12 | (32) | 17
Reclassification adjustment for net losses realized in net income, net of tax | 129 |  |
Ending Balance |  | (115) | (83)
Cumulative Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (1,897) | (7,490) | (4,726)
Foreign currency translation before reclassification |  |  | (2,764)
Foreign currency translation | (3,257) | 5,593 |
Ending Balance | (5,154) | (1,897) | (7,490)
Total Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (2,012) | (7,573) | (4,826)
Foreign currency translation | (3,257) | 5,593 | (2,764)
Ending Balance | $ (5,154) | $ (2,012) | $ (7,573)

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- Definition Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32157-110900 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32022-110900 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a-c) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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