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Equity Awards and Instruments - Option activity (Details) - USD ($) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 15, 2019 | Mar. 22, 2019 | Sep. 06, 2018 | May 29, 2018 | Mar. 22, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock Option |  |  |  |  |  |  |  |
Options Outstanding |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  |  |  |  | 19,514,448 | 18,629,380 |
Granted (in shares) | 10,000 | 4,816,000 | 10,000 | 5,096,000 | 20,000 | 4,826,000 | 5,126,000 |
Exercised |  |  |  |  |  | (4,731,158) | (3,738,182) |
Canceled |  |  |  |  |  | (917,623) | (502,750) |
Ending balance (in shares) |  |  |  |  |  | 18,691,667 | 19,514,448 | 18,629,380
Exercise Price Per share, Range |  |  |  |  |  |  |  |
Exercise per share |  |  |  |  |  | $ 7.24 | $ 6.81 | $ 5.38
Granted |  |  |  |  |  | 7.24 | 8.67 |
Exercised |  |  |  |  |  | $ 6.81 | $ 5.38 |
Canceled |  |  |  |  |  | $ 7.24 | $ 8.67 |
Exercise Price Per Share, Weighted Average |  |  |  |  |  |  |  |
Beginning balance, weighted average exercise price (USD per share) |  |  |  |  |  | $ 4.85 | $ 3.72 |
Granted |  |  |  |  |  | 7.24 | 6.81 |
Exercised |  |  |  |  |  | 2.68 | 1.89 |
Canceled |  |  |  |  |  | 5.82 | 5.04 |
Ending balance, weighted average exercise price (USD per share) |  |  |  |  |  | 5.97 | 4.85 | 3.72
Stock Option | Minimum |  |  |  |  |  |  |  |
Exercise Price Per share, Range |  |  |  |  |  |  |  |
Exercise per share |  |  |  |  |  | 3.50 | 1.79 | $ 0.31
Granted |  |  |  |  |  |  | 6.81 |
Exercised |  |  |  |  |  | $ 1.79 | $ 0.31 |
Canceled |  |  |  |  |  | $ 1.79 | $ 0.31 |
2015 Equity Incentive Plan |  |  |  |  |  |  |  |
Exercise Price Per Share, Weighted Average |  |  |  |  |  |  |  |
Options and other equity awards available for future grants |  |  |  |  |  | 28,101,504 | 30,607,529 |

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