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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock Incentive Plans |
Summary of stock option activity |
|  |  |  |  |  |  | Weighted |  |  |
|  |  |  |  |  |  | Average |  |  |
|  |  |  | Weighted- |  | Remaining |  | Aggregate
|  |  |  | Average Exercise |  | Contractual |  | Intrinsic Value
|  | Shares |  | Price |  | Term (years) |  | (in thousands)
Outstanding at December 31, 2018 |  | 433,389 |  | $ | 29.05 |  | 7.97 |  | $ | —
Granted |  | 454,420 |  | $ | 4.86 |  |  |  |  |
Cancelled or forfeited |  | (101,977) |  | $ | 18.12 |  |  |  |  |
Outstanding at December 31, 2019 |  | 785,832 |  | $ | 16.48 |  | 8.13 |  | $ | 470
Vested and Exercisable at December 31, 2019 |  | 289,782 |  | $ | 33.91 |  | 6.59 |  | $ | 9
Schedule of assumptions made based on the Black-Scholes option pricing model |
|  | Year Ended December 31, |
|  | 2019 |  | 2018 |
Weighted-average expected volatility |  | 68.9 | - | 110.5 | % | 73.7 | - | 76.9 | %
Expected term (in years) |  | 5.50 | - | 10.00 |  | 5.75 | - | 6.25 |
Risk-free interest rate |  | 1.39 | - | 2.69 | % | 2.67 | - | 2.84 | %
Expected dividend yield |  |  |  | 0 | % |  |  | 0 | %

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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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