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Fair value measurements (Details 1) | 9 Months Ended
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Sep. 30, 2018 USD ($) | [1]
Net asset arising from put/call options |
Balance as of December 31, 2017 | $ 280,000
Unrealized loss | (47,000)
Balance as of September 30, 2018 | $ 233,000
[1] | In connection with the Company’s acquisition of 51% of Aerex in February 2016, the Company acquired from Aerex’s former sole shareholder an option to compel such shareholder to sell, and granted to such shareholder an option to require the Company to purchase, the shareholder’s remaining 49% ownership interest in Aerex at a price based upon the fair market value of Aerex at the time of the exercise of the option. The options are exercisable on or after the third anniversary of the February 2016 acquisition date. The net asset arising from the put/call options is included in other assets in the accompanying condensed consolidated balance sheets as of September 30, 2018 and December 31, 2017.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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