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Other comprehensive income (loss) and accumulated other comprehensive items - (Tables)

12 Months Ended

Dec. 31, 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 table summarizes other comprehensive income (loss) and the changes in accumulated other comprehensive items, by component, for the years ended December 31, 2020, 2019, and 2018, respectively.

​

​	​	​	​	​	​	​	​	​	​
​		Unrealized			​	​		Total
​	​	Gains		​	​	​	​	Accumulated
​	​	On		​	Foreign		​	Other
​	​	Marketable		​	Currency		​	Comprehensive
​	​	Securities, net of tax		​	Translation		​	Items
Balance at December 31, 2017	​	$	22	​	$	3,947	​	$	3,969
Other comprehensive income (loss) before reclassifications	​		9	​		(2,516)	​		(2,507)
Amounts reclassified from other comprehensive items	​		—	​		—	​		—
Other comprehensive income (loss)	​		9	​		(2,516)	​		(2,507)
Balance at December 31, 2018	​	$	31	​	$	1,431	​	$	1,462
Other comprehensive income (loss) before reclassifications	​		724	​		(12,770)	​		(12,046)
Amounts reclassified from other comprehensive items	​		—	​		—	​		—
Other comprehensive income (loss)	​		724	​		(12,770)	​		(12,046)
Balance at December 31, 2019	​	$	755	​	$	(11,339)	​	$	(10,584)
Other comprehensive income (loss) before reclassifications	​		1,145	​		(51,518)	​		(50,373)
Amounts reclassified from other comprehensive items	​		—	​		—	​		—
Other comprehensive income (loss)	​		1,145	​		(51,518)	​		(50,373)
Balance at December 31, 2020	​	$	1,900	​	$	(62,857)	​	$	(60,957)

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- References

No definition available.

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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

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