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Summary of Significant Accounting Policies - Revenues by Geographic Area (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2018 USD ($) Segment | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of geographic segments | Segment |  |  |  |  |  |  |  |  | 2 |  |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 54,033 | $ 50,562 | $ 49,482 | $ 49,127 | $ 50,641 | $ 45,007 | $ 48,947 | $ 54,894 | $ 203,204 | $ 199,489 | $ 206,540
Americas |  |  |  |  |  |  |  |  |  |  |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 151,609 | 150,841 | 158,291
Asia/Pacific & Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 51,595 | 48,648 | 48,249
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 9,800 |  |  |  | 6,200 |  |  |  | 9,800 | 6,200 |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 142,452 | 144,842 | 152,830
Japan |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 900 |  |  |  | $ 900 |  |  |  | 900 | 900 |
Revenues from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 41,843 | $ 39,390 | $ 36,343

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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