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Fair value of financial instruments and marketable securities (Details 4) - USD ($) $ / shares in Units, $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Warrants
Changes in the fair value of warrant liability
Beginning balance		$ 48	$ 188
Change in fair value		(47)	(140)
Ending balance	$ 1	$ 1	$ 48
Warrants | Minimum
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Volatility (as a percent)		62.00%	62.00%
Risk-free interest rate (as a percent)		0.62%	0.86%
Strike price (in dollars per share)	$ 128.00	$ 128.00	$ 128.00
Expected life		5 months 12 days	1 year 6 months
Warrants | Maximum
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model
Volatility (as a percent)		67.00%	70.00%
Risk-free interest rate (as a percent)		1.34%	1.54%
Strike price (in dollars per share)	2,520.00	$ 2,520.00	$ 2,520.00
Expected life		2 years 8 months 19 days	3 years 8 months 12 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)	$ 10.91	$ 10.91	$ 32.4
Stock Appreciation Rights (SARs)
Changes in the fair value of warrant liability
Beginning balance	$ 140
Change in fair value	725
Ending balance	$ 865	$ 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 (as a percent)		48.00%
Risk-free interest rate (as a percent)		0.44%
Strike price (in dollars per share)	$ 6.76	$ 6.76
Expected life			4 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 (as a percent)		71.00%
Risk-free interest rate (as a percent)		1.47%
Strike price (in dollars per share)			$ 30.86
Expected life			3 years 4 days
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)	$ 10.91	$ 10.91

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Agreed upon price for the exchange of the underlying asset.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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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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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