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Stock award plan - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 05, 2013 | Jan. 31, 2020 | Jun. 30, 2016 | May 31, 2016 | May 31, 2013 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2016
Stock option plan |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 16,779,000 | $ 10,484,000 | $ 48,909,000 | $ 30,668,000 |
Unrecognized compensation cost |  |  |  |  |  | $ 173,200,000 |  | $ 173,200,000 |  |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  |  |  |  | 2 years 10 months 28 days |  |
Common stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 935,092 |  | 935,092 |  |
Unvested restricted stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Grants in period (in shares) |  |  |  |  |  |  |  | 625,390 |  |
Stock option |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 2,671,660 |  |
Inducement grants for non-statutory stock options (in shares) |  |  |  |  |  |  |  | 667,285 |  |
Expected dividend yield (as a percent) |  |  |  |  |  |  |  | 0.00% |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  |  | $ 36.76 |  |
Expected term (in years) |  |  |  |  |  |  |  | 5 years 9 months |  |
Stock option | Maximum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  |  |  |  |  |  | 1.45% |  |
Expected volatility (as a percent) |  |  |  |  |  |  |  | 89.31% |  |
Stock option | Minimum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  |  |  |  |  |  | 0.34% |  |
Expected volatility (as a percent) |  |  |  |  |  |  |  | 87.50% |  |
SARs |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 897,290 |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | 4 years
Vested (in shares) |  |  |  |  |  |  |  | 132,136 |  |
Stock appreciation rights liability |  |  |  |  |  | $ 0 |  | $ 0 |  |
2013 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 0 |  |  |  |  |  |  |  |  |
2013 Stock Incentive Plan | Common stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | 739,937 |  |  |  |  |  |  |  |  |
2013 Stock Incentive Plan | Unvested restricted stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Grants in period (in shares) | 735,324 |  |  |  |  |  |  |  |  |
2013 Stock Incentive Plan | Stock option |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 4,613 |  |  |  |  |  |  |  |  |
2009 Equity and Long Term Incentive Plan |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 0 |  | 0 |  |
Number of additional shares authorized (in shares) |  |  |  |  | 2,500,000 |  |  |  |  |
2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan | Common stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  | 122,296 |  |  |  |  |
2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan | 1998 Employee, Director and Consultant Stock Option Plan | Common stock | Maximum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares subject to outstanding awards (in shares) |  |  |  |  | 3,040,444 |  |  |  |  |
2013 Long Term Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Annual Increase Number |  |  |  |  | 2,500,000 |  |  |  |  |
Annual increase in the number of shares outstanding on the first day of the fiscal year |  |  |  |  | 4.00% |  |  |  |  |
2020 inducement stock incentive plan [Member] | Common stock |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 291,025 |  | 291,025 |  |
Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Annual Increase Number |  | 1,000,000 |  |  |  |  |  |  |  |
Employee Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  | 1,000,000 |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 600,000 |  | $ 1,300,000 |  |
Award requisite service period |  |  | 6 months |  |  |  |  |  |  |
Purchase price of common stock, percent |  |  | 85.00% |  |  |  |  |  |  |
Employee stock purchase plan, voting percentage limit |  |  | 5.00% |  |  |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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