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Fair value of financial instruments and marketable securities - Warrants and SARs (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
SARs
Changes in the fair value of warrant liability and SARs liability
December 31, 2016	$ 865
Change in fair value	464
Payments	(1,064)
March 31, 2017	$ 265	$ 865
Minimum | SARs
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Volatility	67.00%	48.00%
Risk-free interest rate (as a percent)	0.97%	0.44%
Strike price (in dollars per share)	$ 6.76	$ 6.76
Expected life	9 months 4 days	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	69.00%	71.00%
Risk-free interest rate (as a percent)	1.50%	1.47%
Strike price (in dollars per share)	$ 30.86	$ 30.86
Expected life	2 years 9 months 4 days	3 years
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)	$ 9.84	$ 10.91
Warrants
Changes in the fair value of warrant liability and SARs liability
December 31, 2016	$ 1
Change in fair value	0
Payments	0
March 31, 2017	$ 1	$ 1
Warrants | Minimum
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Volatility	55.00%	62.00%
Risk-free interest rate (as a percent)	0.76%	0.62%
Strike price (in dollars per share)	$ 128.00	$ 128.00
Expected life	2 months 16 days	4 months 24 days
Warrants | Maximum
Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model
Volatility	69.00%	67.00%
Risk-free interest rate (as a percent)	1.39%	1.34%
Strike price (in dollars per share)	$ 2,520.00	$ 2,520.00
Expected life	2 years 5 months 23 days	2 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)	$ 9.84	$ 10.91

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Agreed upon price for the exchange of the underlying asset.

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-Publisher FASB
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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 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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Price of a single share of a number of saleable stocks of a company.

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