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Fair value of financial instruments and marketable securities - Warrants and SARs (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
SARs
Changes in the fair value of warrant liability and SARs liability
December 31, 2015	$ 0
Change in fair value	838
September 30, 2016	$ 838	$ 0
Minimum | SARs
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Volatility (as a percent)	69.00%
Risk-free interest rate (as a percent)	0.29%
Strike price (in dollars per share)	$ 6.76
Expected life	3 months 4 days
Maximum | SARs
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Volatility (as a percent)	75.00%
Risk-free interest rate (as a percent)	0.88%
Strike price (in dollars per share)	$ 30.86
Expected life	3 years 3 months 4 days
Common stock | SARs
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Fair value of shares (in dollars per share)	$ 14.01
Warrants
Changes in the fair value of warrant liability and SARs liability
December 31, 2015	$ 48
Change in fair value	(44)
September 30, 2016	$ 4	$ 48
Warrants | Minimum
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Volatility (as a percent)	68.00%	62.00%
Risk-free interest rate (as a percent)	0.52%	0.86%
Strike price (in dollars per share)	$ 128.00	$ 128.00
Expected life	8 months 16 days	1 year 6 months
Warrants | Maximum
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Volatility (as a percent)	75.00%	70.00%
Risk-free interest rate (as a percent)	0.88%	1.54%
Strike price (in dollars per share)	$ 2,520.00	$ 2,520.00
Expected life	2 years 11 months 23 days	3 years 8 months 12 days
Warrants | Common stock
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Fair value of shares (in dollars per share)	$ 14.01	$ 32.40

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Agreed upon price for the exchange of the underlying asset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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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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-Publisher FASB
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-Topic 820
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-Section 50
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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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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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