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Stock Incentive Plan (Tables) | 9 Months Ended
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Sep. 30, 2020
Stock Incentive Plan |
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 | ​ | 647,090 | ​ | $ 9.19 | ​ | ​ | ​ | ​
Exercised | ​ | (326,622) | ​ | $ 5.22 | ​ | ​ | ​ | ​
Cancelled | ​ | (103,586) | ​ | $ 20.18 | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding, September 30, 2020 | ​ | 3,637,063 | ​ | $ 12.52 | ​ | 5.93 | ​ | $ 10,901
Exercisable, September 30, 2020 | ​ | 2,127,093 | ​ | $ 9.78 | ​ | ​ | ​ | $ 9,125
Schedule of weighted-average assumptions for options granted | ​
​ | ​ | ​ | ​ | ​ | ​
Nine months ended September 30, |  | 2020 | ​ | 2019 |
​ | ​ | ​
Expected term (in years) |  | 5.69 | ​ | 5.76 | ​
Expected volatility |  | 59.25 | % | 56.03 | %
Risk free rate |  | 0.35 | % | 1.54 | %
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 | ​ | 995,940 | ​ | $ 9.52 | ​ | ​ | ​ | ​
Released | ​ | (168,311) | ​ | $ 18.80 | ​ | ​ | ​ | ​
Forfeited | ​ | (81,555) | ​ | $ 18.91 | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested September 30, 2020 | ​ | 1,859,770 | ​ | $ 15.51 | ​ | 2.45 | ​ | $ 21,572
Vested and Expected to Vest | ​ | 1,859,770 | ​ | $ 15.51 | ​ | ​ | ​ | ​

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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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