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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Stock-based Compensation |
Weighted Average Assumptions | The fair value of the stock options granted during the three months ended March 31, 2020 and 2019, was estimated based on the following weighted average assumptions:
|  | Three Months Ended March 31, |
|  | 2020 |  | 2019 |
Dividend yield |  | 0 | % | 0 | %
Expected volatility |  | 100 | % | 103 | %
Risk-free interest rate |  | 0.90 | % | 2.55 | %
Expected term |  | 5.57 years |  | 5.60 years |
Stock Option Activity | Stock option activity for the three months ended March 31, 2020, was as follows:
|  |  |  | Weighted |  | Weighted |  | Aggregate
|  |  |  | Average |  | Average |  | Intrinsic
|  |  |  | Exercise |  | Contractual |  | Value
|  | Number of |  | Price |  | Term |  | (in
|  | shares |  | Per Share |  | (in years) |  | thousands)
Outstanding at beginning of year |  | 1,839,623 |  | $ | 20.42 |  | 6.88 |  | $ | 26,829
Granted |  | 138,800 |  |  | 21.28 |  |  |  |  |
Exercised |  | — |  |  | — |  |  |  |  |
Forfeited, expired or cancelled |  | (17,011) |  |  | 147.00 |  |  |  |  |
Outstanding at end of period |  | 1,961,412 |  | $ | 19.39 |  | 6.92 |  | $ | 17,154
Exercisable at end of period |  | 1,539,655 |  | $ | 19.74 |  | 6.31 |  | $ | 15,682
Stock-based Compensation Expense | The following table shows total stock-based compensation expense for stock options, RSUs and ESPP in the condensed consolidated statements of operations and comprehensive (loss) income (in thousands):
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
Research and development |  | $ | — |  | $ | 49
General and administrative |  |  | 1,788 |  |  | 1,679
Total stock-based compensation expense |  | $ | 1,788 |  | $ | 1,728

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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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