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Fair value of financial instruments and marketable securities - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Financial assets and liabilities measured at fair value on recurring basis |  |
Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy | $ 0 | $ 0
Realized gains | $ 30,000 | $ 0
Warrants |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Risk-free interest rate (as a percent) | 1.38% |
Minimum | Warrants |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Volatility | 69.00% | 62.00%
Risk-free interest rate (as a percent) |  | 0.62%
Strike price (in dollars per share) | $ 128.00 | $ 128.00
Expected life | 2 years 1 month 6 days | 4 months 24 days
Maximum | Warrants |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Volatility | 70.00% | 67.00%
Risk-free interest rate (as a percent) |  | 1.34%
Strike price (in dollars per share) | $ 2,520.00 | $ 2,520.00
Expected life | 2 years 2 months 23 days | 2 years 8 months 12 days
Common stock | Warrants |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Fair value of shares (in dollars per share) | $ 18.33 | $ 10.91
SARs | Minimum |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Volatility | 67.00% | 48.00%
Risk-free interest rate (as a percent) | 1.14% | 0.44%
Strike price (in dollars per share) | $ 6.76 | $ 6.76
Expected life | 6 months 7 days | 4 days
SARs | Maximum |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Volatility | 70.00% | 71.00%
Risk-free interest rate (as a percent) | 1.47% | 1.47%
Strike price (in dollars per share) | $ 30.86 | $ 30.86
Expected life | 2 years 6 months 7 days | 3 years
SARs | Common stock |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Fair value of shares (in dollars per share) | $ 18.33 | $ 10.91

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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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 Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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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