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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
	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.

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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

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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.

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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.

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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.

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