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Other comprehensive income (loss) and accumulated other comprehensive items
 12 Months Ended
Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Other comprehensive income (loss) and accumulated other comprehensive items
Other comprehensive income (loss) and accumulated other comprehensive items
Other comprehensive income (loss) includes changes in equity that are excluded from net loss, such as unrealized gains and losses on marketable securities.
The following table summarizes other comprehensive income (loss) and the changes in accumulated other comprehensive items, by component, for the years ended December 31, 2017, 2016, and 2015, respectively.
 
 
Unrealized
Gains/(Losses)
On
Marketable
Securities
 
Foreign
Currency
Translation
 
Total
Accumulated
Other
Comprehensive
Items
Balance at December 31, 2014
 
$
(387
)
 
$
(350
)
 
$
(737
)
Other comprehensive loss before reclassifications          
 
(202
)
 
(261
)
 
(463
)
Amounts reclassified from other comprehensive items          
 
—

 
—

 
—

Other comprehensive loss
 
(202
)
 
(261
)
 
(463
)
Balance at December 31, 2015
 
$
(589
)
 
$
(611
)
 
$
(1,200
)
Other comprehensive income (loss) before reclassifications
 
386

 
(671
)
 
(285
)
Amounts reclassified from other comprehensive items          
 
—

 
—

 
—

Other comprehensive income (loss)
 
386

 
(671
)
 
(285
)
Balance at December 31, 2016
 
$
(203
)
 
$
(1,282
)
 
$
(1,485
)
Other comprehensive income before reclassifications
 
225

 
5,229

 
5,454

Amounts reclassified from other comprehensive items          
 
—

 
—

 
—

Other comprehensive income
 
225

 
5,229

 
5,454

Balance at December 31, 2017
 
$
22

 
$
3,947

 
$
3,969