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Fair value of financial instruments and investments - Fair Value of Liabilities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Warrants
Changes in the fair value of warrant liability
Beginning balance	$ 1	$ 48
Fair value of issuances	0	0
Change in fair value	0	(47)
Payments	0
Ending balance	$ 1	$ 1
Warrants | Minimum
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Volatility	69.00%	62.00%
Risk-free interest rate	1.89%	0.62%
Strike price (in dollars per share)	$ 128.00	$ 128.00
Expected life	1 year 7 months 2 days	5 months 12 days
Warrants | Maximum
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Volatility	69.00%	67.00%
Risk-free interest rate	1.89%	1.34%
Strike price (in dollars per share)	$ 2,520.00	$ 2,520.00
Expected life	1 year 8 months 19 days	2 years 8 months 19 days
Warrants | Common stock
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Fair value of shares (in dollars per share)	$ 16.68	$ 10.91
Stock Appreciation Rights (SARs)
Changes in the fair value of warrant liability
Beginning balance	$ 865	$ 0
Fair value of issuances	0	140
Change in fair value	1,864	725
Payments	(1,064)
Ending balance	$ 1,665	$ 865
Stock Appreciation Rights (SARs) | Minimum
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Volatility	31.00%	48.00%
Risk-free interest rate	1.28%	0.44%
Strike price (in dollars per share)	$ 6.76	$ 6.76
Expected life	0 days	0 days
Stock Appreciation Rights (SARs) | Maximum
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Volatility	70.00%	71.00%
Risk-free interest rate	1.89%	1.47%
Strike price (in dollars per share)	$ 30.86	$ 30.86
Expected life	2 years	3 years
Stock Appreciation Rights (SARs) | Common stock
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Fair value of shares (in dollars per share)	$ 16.68	$ 10.91

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Agreed upon price for the exchange of the underlying asset.

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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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.

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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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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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Price of a single share of a number of saleable stocks of a company.

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