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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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- Definition Agreed upon price for the exchange of the underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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