v3.19.3

Stock incentive plans - Stock option awards (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 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) | (27) |
Canceled/forfeited (in shares) | 0 |
Outstanding and exercisable at end of period (in shares) | 277 | 304
Weighted Average Exercise Price |  |
Outstanding at beginning of period (in dollars per share) | $ 7.49 |
Exercised (in dollars per share) | 5.72 |
Canceled/forfeited (in dollars per share) | 0 |
Outstanding and exercisable at end of period (in dollars per share) | $ 7.66 | $ 7.49
Weighted-Average Remaining Contract Life (years) |  |
Outstanding and exercisable at end of period | 3 years 1 month 6 days | 3 years 9 months 18 days
Aggregate Intrinsic Value |  |
Outstanding and exercisable at end of period | $ 1,044 | $ 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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