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Stock Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Stock Incentive Plans |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​
​ | ​ | Options | ​ | Weighted Average Exercise Price | ​ | Weighted Average Remaining Contractual Life | ​ | Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2019 | ​ | 3,420,181 | ​ | $ 12.69 | ​ | 5.7 | ​ | $ 26,074
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Granted | ​ | 600,130 | ​ | $ 9.00 | ​ | ​ | ​ | ​
Vested | ​ | (246,579) | ​ | $ 4.90 | ​ | ​ | ​ | ​
Cancelled | ​ | (85,499) | ​ | $ 21.44 | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding, June 30, 2020 | ​ | 3,688,233 | ​ | $ 12.41 | ​ | 6.10 | ​ | $ 5,690
Exercisable, June 30, 2020 | ​ | 2,070,181 | ​ | $ 8.77 | ​ | 4.02 | ​ | $ 5,394
Schedule of weighted-average assumptions for options granted | ​
​ | ​ | ​ | ​ | ​ | ​
Six months ended June 30, |  | 2020 | ​ | 2019 |
​ | ​ | ​
Expected term (in years) |  | 5.88 | ​ | 5.76 | ​
Expected volatility |  | 59.52 | % | 53.61 | %
Risk free rate |  | 0.38 | % | 2.59 | %
Expected dividends |  | — | % | — | %
Summary of stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Outstanding Stock Units
​ | ​ | Stock Units | ​ | Weighted-Average Fair Value at Date of Grant per Share | ​ | Weighted Average Remaining Vesting Life | ​ | Aggregate Intrinsic Value (in thousands)
Unvested December 31, 2019 | ​ | 1,113,696 | ​ | $ 21.62 | ​ | 2.26 | ​ | $ 19,800
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Granted | ​ | 849,890 | ​ | $ 9.09 | ​ | ​ | ​ | ​
Vested | ​ | (145,886) | ​ | $ 18.18 | ​ | ​ | ​ | ​
Forfeited | ​ | (73,982) | ​ | $ 19.66 | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested June 30, 2020 | ​ | 1,743,718 | ​ | $ 15.89 | ​ | 2.23 | ​ | $ 16,066
Vested and Expected to Vest | ​ | 1,743,718 | ​ | $ 15.89 | ​ | 2.23 | ​ | $ 16,066

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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