XML 43 R29.htm IDEA: XBRL DOCUMENT
v3.20.1

Equity Plans (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2020
Schedule of activity under equity incentive plans |
|  |  |  | Weighted- |  | Weighted- |  |
|  |  |  | Average |  | Average |  |
|  |  |  | Exercise |  | Remaining |  | Aggregate
|  | Options |  | Price Per |  | Contractual |  | Intrinsic
|  | Outstanding |  | Share |  | Life (years) |  | Value (1)
|  |  |  |  |  |  |  |  | (in millions)
Balances at December 31, 2019 |  | 3,681,521 |  | $ | 11.64 |  | 7.78 |  |  |
Options granted |  | 977,600 |  |  | 7.78 |  |  |  |  |
Options exercised |  | (29,167) |  |  | 1.50 |  |  |  |  |
Options forfeited |  | (52,367) |  |  | 11.85 |  |  |  |  |
Balances at March 31, 2020 |  | 4,577,587 |  | $ | 10.87 |  | 8.06 |  | $ | 2.2
Options exercisable – March 31, 2020 |  | 2,167,161 |  | $ | 11.90 |  | 6.84 |  | $ | 2.2
Options vested and expected to vest – March 31, 2020 |  | 4,577,587 |  | $ | 10.87 |  | 8.06 |  | $ | 2.2
| (1) |  | The aggregate intrinsic values were calculated as the difference between the exercise price of the options and the closing price of the Company’s common stock on March 31, 2020. The calculation excludes options with an exercise price higher than the closing price of the Company’s common stock on March 31, 2020.
Schedule of stock-based compensation expense | Total stock-based compensation expense was as follows (in thousands):
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
Research and development |  | $ | 1,066 |  | $ | 1,122
General and administrative |  |  | 982 |  |  | 857
Total stock-based compensation expense |  | $ | 2,048 |  | $ | 1,979
Employee stock options |
Black-Scholes option-pricing model assumptions |
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
Expected term (in years) |  | 5.27 - 6.08 |  | 6.02 - 6.08
Expected volatility |  | 72.1% - 73.8% |  | 62.2% - 62.6%
Risk-free interest rate |  | 0.59% - 1.44% |  | 2.45% - 2.58%
Dividend yield |  | — |  | —
Restricted stock units |
Schedule of activity under equity incentive plans |
|  |  |  | Weighted
|  |  |  | Average
|  | Number of |  | Grant Date
|  | Shares |  | Fair Value
Unvested at December 31, 2019 |  | 278,482 |  | $ | 10.08
Granted |  | 142,000 |  |  | 7.80
Vested |  | (131,147) |  |  | 9.52
Forfeited |  | (9,338) |  |  | 9.35
Unvested at March 31, 2020 |  | 279,997 |  | $ | 9.21

X
- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -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 (c)(2) -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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |