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Other comprehensive income (loss) and accumulated other comprehensive items - (Tables) | 9 Months Ended
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Sep. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Summary of other comprehensive income (loss) and the changes in accumulated other comprehensive items | The following tables summarize other comprehensive income (loss) and the changes in accumulated other comprehensive items for the three and nine month periods ended September 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized |  | ​ | ​ |  | Total
​ | ​ | Gains/(Losses) | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | On | ​ | Foreign | ​ | Other
​ | ​ | Marketable | ​ | Currency | ​ | Comprehensive
​ | ​ | Securities, net of tax | ​ | Translation | ​ | Items
Balance, June 30, 2020 | ​ | $ | 3,410 | ​ | $ | (13,426) | ​ | $ | (10,016)
Other comprehensive loss before reclassifications | ​ |  | (1,016) | ​ |  | (24,695) | ​ |  | (25,711)
Amounts reclassified from other comprehensive items | ​ |  | — | ​ |  | — | ​ |  | —
Other comprehensive loss before reclassifications | ​ |  | (1,016) | ​ |  | (24,695) | ​ |  | (25,711)
Balance, September 30, 2020 | ​ | $ | 2,394 | ​ | $ | (38,121) | ​ | $ | (35,727)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized |  | ​ | ​ |  | Total
​ | ​ | Gains | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | On | ​ | Foreign | ​ | Other
​ | ​ | Marketable | ​ | Currency | ​ | Comprehensive
​ | ​ | Securities, net of tax | ​ | Translation | ​ | Items
Balance, December 31, 2019 | ​ | $ | 755 | ​ | $ | (11,339) | ​ | $ | (10,584)
Other comprehensive income (loss) before reclassifications | ​ |  | 1,639 | ​ |  | (26,782) | ​ |  | (25,143)
Amounts reclassified from other comprehensive items | ​ |  | — | ​ |  | — | ​ |  | —
Other comprehensive income (loss) | ​ |  | 1,639 | ​ |  | (26,782) | ​ |  | (25,143)
Balance, September 30, 2020 | ​ | $ | 2,394 | ​ | $ | (38,121) | ​ | $ | (35,727)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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