v3.19.1

Stock incentive plans - Stock option awards (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Stock incentive plans |  |
Vesting period | 4 years |
Number of Options |  |
Outstanding at beginning of period (in shares) | 304 |
Exercised (in shares) | (4) |
Canceled/forfeited (in shares) | 0 |
Outstanding and exercisable at end of period (in shares) | 300 | 304
Weighted Average Exercise Price |  |
Outstanding at beginning of period (in dollars per share) | $ 7.49 |
Exercised (in dollars per share) | 2.01 |
Outstanding and exercisable at end of period (in dollars per share) | $ 7.55 | $ 7.49
Weighted-Average Remaining Contract Life (years) |  |
Outstanding and exercisable at end of period | 3 years 7 months 6 days | 3 years 9 months 18 days
Aggregate Intrinsic Value |  |
Outstanding and exercisable at end of period | $ 4,766 | $ 3,970
Vesting in 12 months |  |
Stock incentive plans |  |
Vesting period | 12 months |
Vesting percentage | 25.00% |
Vesting monthly 12 months after grant date |  |
Stock incentive plans |  |
Vesting percentage | 75.00% |

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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