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Share-Based Payment Awards (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Option Activity Under Plan | The following table provides a reconciliation of stock option activity under the Company’s equity incentive plans and for inducement awards for the year ended December 31, 2021:
|  | Number of options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Outstanding at January 1, 2021 |  |  | 1,338,880 |  |  | $ | 20.86 |  |  |  |  |  |  |  |  |
Granted |  |  | 1,313,727 |  |  |  | 12.59 |  |  |  |  |  |  |  |  |
Exercised |  |  | (8,112 | ) |  |  | 12.26 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (75,448 | ) |  |  | 16.46 |  |  |  |  |  |  |  |  |
Expired |  |  | (51,367 | ) |  |  | 31.04 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2021 |  |  | 2,517,680 |  |  | $ | 16.49 |  |  |  | 8.06 |  |  | $ | 775 |
Exercisable at December 31, 2021 |  |  | 916,461 |  |  | $ | 22.41 |  |  |  | 6.25 |  |  | $ | 103 |
Schedule of Key Assumptions Used | In determining the grant date fair value of option awards during the years ended December 31, 2021 and 2020, the Company applied the Black-Scholes option pricing model based on the following key assumptions:
|  | Year Ended December 31, |  |  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Option life (in years) |  | 4.75 - 6.08 |  |  | 5.50 - 6.10 |
Stock volatility |  | 72% - 83% |  |  | 64% - 70% |
Risk-free interest rate |  | 0.42% - 1.44% |  |  | 0.32% - 1.76% |
Expected dividends |  | 0.0% |  |  | 0.0% |
Summary of Information about Stock Options | The following table summarizes information about employee, consultant and director stock options under the Company’s equity incentive plans for the years ended December 31, 2021 and 2020 (in thousands except per share amounts):
|  | Year Ended December 31, |  |  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Weighted-average grant date fair value per share |  | $ | 8.20 |  |  | $ | 7.07 |
Total cash received from exercise of stock options |  |  | 100 |  |  |  | — |
Total intrinsic value of stock options exercised |  |  | 10 |  |  |  | — |
Summary of Restricted Stock Unit Activity | The following table provides a reconciliation of RSU activity under the 2016 Plan for the year ended December 31, 2021:
|  | Number of Restricted Stock Units |  |  | Weighted Average Grant Date Fair Value |
Nonvested at January 1, 2021 |  |  | 149,004 |  |  | $ | 13.85 |
Granted |  |  | 242,399 |  |  |  | 12.96 |
Vested |  |  | (89,795 | ) |  |  | 13.76 |
Forfeited |  |  | (10,033 | ) |  |  | 12.15 |
Nonvested at December 31, 2021 |  |  | 291,575 |  |  | $ | 13.19 |
Compensation Expense from Stock-Based Payment Awards | The Company’s statements of comprehensive loss included total compensation expense from stock-based payment awards as follows (in thousands):
|  | Year Ended December 31, |  |  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Compensation expense included in: |  |  |  |  |  |  |  |
Research and development |  | $ | 2,294 |  |  | $ | 1,411 |
Sales and marketing |  |  | 1,187 |  |  |  | 907 |
General and administrative |  |  | 3,966 |  |  |  | 3,229 |
|  | $ | 7,447 |  |  | $ | 5,547 |

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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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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