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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | $ 156,437 | $ 119,583 | $ 226,001
Other comprehensive income (loss) before reclassifications | (2,507) | 5,454 | (285)
Amounts reclassified from other comprehensive items | 0 | 0 | 0
Other comprehensive income (loss) | (2,507) | 5,454 | (285)
Balance at the end of the period | 350,727 | 156,437 | 119,583
Unrealized (Losses)/Gains On Marketable Securities, net of tax |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | 22 | (203) | (589)
Other comprehensive income (loss) before reclassifications | 9 | 225 | 386
Amounts reclassified from other comprehensive items | 0 | 0 | 0
Other comprehensive income (loss) | 9 | 225 | 386
Balance at the end of the period | 31 | 22 | (203)
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | 3,947 | (1,282) | (611)
Other comprehensive income (loss) before reclassifications | (2,516) | 5,229 | (671)
Amounts reclassified from other comprehensive items | 0 | 0 | 0
Other comprehensive income (loss) | (2,516) | 5,229 | (671)
Balance at the end of the period | 1,431 | 3,947 | (1,282)
Total Accumulated Other Comprehensive Items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at the beginning of the period | 3,969 | (1,485) | (1,200)
Balance at the end of the period | $ 1,462 | $ 3,969 | $ (1,485)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: 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=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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