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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 05, 2013 | Jun. 30, 2016 | May 31, 2016 | May 31, 2013 | Mar. 31, 2019 | Mar. 31, 2018
Stock option plan |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 9,263 | $ 7,748
Unrecognized compensation cost |  |  |  |  | $ 100,000 |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  | 3 years 2 months 27 days |
Common stock |  |  |  |  |  |
Stock option plan |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  |  | 323,395 |
Unvested restricted stock |  |  |  |  |  |
Stock option plan |  |  |  |  |  |
Grants in period (in shares) |  |  |  |  | 304,549 |
Stock option |  |  |  |  |  |
Stock option plan |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 2,490,970 |
Inducement grants for non-statutory stock options (in shares) |  |  |  |  | 292,550 |
Expected dividend yield (as a percent) |  |  |  |  | 0.00% |
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 19.72 |
SARs |  |  |  |  |  |
Stock option plan |  |  |  |  |  |
Granted (in shares) |  |  | 897,290 |  |  |
Vesting period |  |  |  |  | 4 years |
Vested (in shares) |  |  |  |  | 157,930 |
Share-based compensation expense |  |  |  |  | $ 1,000 |
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 |
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 |  |  |  |
Share-based compensation expense |  |  |  |  | $ 300 |
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 Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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