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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 05, 2013 | Jun. 30, 2016 | May 31, 2016 | May 31, 2013 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stock option plan |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 10,484 | $ 8,942 | $ 30,668 | $ 24,773
Unrecognized compensation cost |  |  |  |  | $ 104,000 |  | $ 104,000 |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  |  |  | 3 years 10 days |
Common stock |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  |  | 453,992 |  | 453,992 |
Unvested restricted stock |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Grants in period (in shares) |  |  |  |  |  |  | 306,549 |
Stock option |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 3,265,220 |
Inducement grants for non-statutory stock options (in shares) |  |  |  |  |  |  | 999,300 |
Expected dividend yield (as a percent) |  |  |  |  |  |  | 0.00% |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  | $ 21.49 |
SARs |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 897,290 |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |
Vested (in shares) |  |  |  |  |  |  | 157,930 |
Share-based compensation expense |  |  |  |  | $ 400 |  | $ 2,300 |
2013 Stock Incentive Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | 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 |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  |  | 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 |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  | 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 |  |  |  |  |  |  |  |
Annual increase in the number of shares (in shares) on the first day of the fiscal year |  |  |  | 2,500,000 |  |  |  |
Annual increase in the number of shares outstanding on the first day of the fiscal year |  |  |  | 4.00% |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  | 1,000,000,000,000 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 300 |  | $ 900 |
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 Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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