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Fair value of financial instruments and investments - Summary of changes in the fair value of the Company's Level 3 valuation (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Warrants |  |
Changes in the fair value of warrant liability |  |
Beginning balance | $ 1,000 |
Ending balance | 0 | $ 1,000
Stock Appreciation Rights (SARs) |  |
Changes in the fair value of warrant liability |  |
Beginning balance | 1,665,000 |
Ending balance | 3,814,000 | 1,665,000
Significant unobservable inputs (level 3) | Warrants |  |
Changes in the fair value of warrant liability |  |
Beginning balance | 1,000 | 1,000
Change in fair value | (1,000) | 0
Payments | 0 | 0
Additions | 0 |
Ending balance | 0 | 1,000
Significant unobservable inputs (level 3) | Stock Appreciation Rights (SARs) |  |
Changes in the fair value of warrant liability |  |
Beginning balance | 1,665,000 | 865,000
Change in fair value | 4,140,000 | 1,864,000
Payments | (1,991,000) | (1,064,000)
Additions | 0 |
Ending balance | 3,814,000 | $ 1,665,000
Significant unobservable inputs (level 3) | Agilis |  |
Changes in the fair value of warrant liability |  |
Ending balance | $ 53,200,000 |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized on the income statement for 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)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of issuances 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)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) 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)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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