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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Assumptions Used To Estimate Fair Value of Options | The assumptions used to estimate fair value and the resulting grant date fair values are as follows:
|  | Employees |  |  | Non-employee Directors |
|  | Years Ended December 31, |  |  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Weighted average expected volatility |  |  | 66.47 | % |  |  | 52.31 | % |  |  | 65.36 | % |  |  | 58.65 | %
Weighted average risk-free interest rate |  |  | 2.47 | % |  |  | 2.64 | % |  |  | 2.11 | % |  |  | 2.44 | %
Weighted average expected term (in years) |  |  | 6.03 |  |  |  | 6.02 |  |  |  | 5.54 |  |  |  | 5.28 |
Schedule of Share-based Compensation, Stock Options, Activity | The activity for the 2009 Plan, 2014 Plan and 2015 Plan for the years ended December 31, 2019 is summarized as follows:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value ($000) |
Outstanding — January 1, 2019 |  |  | 4,052,913 |  |  | $ | 4.37 |  |  |  | 7.23 |  |  | $ | — |
Granted |  |  | 1,701,500 |  |  |  | 1.24 |  |  |  |  |  |  |  |  |
Exercised |  |  | (22,500 | ) |  |  | 0.54 |  |  |  |  |  |  |  |  |
Forfeited/expired |  |  | (470,053 | ) |  |  | 7.96 |  |  |  |  |  |  |  |  |
Outstanding — December 31, 2019 |  |  | 5,261,860 |  |  | $ | 3.06 |  |  |  | 7.62 |  |  | $ | 60 |
Exercisable — December 31, 2019 |  |  | 2,988,580 |  |  | $ | 4.17 |  |  |  | 6.83 |  |  | $ | 33 |
Vested or expected to vest —December 31, 2019 |  |  | 5,261,860 |  |  | $ | 3.06 |  |  |  | 7.62 |  |  | $ | 60 |
Schedule of Restricted Stock Units ("RSU") Activity | Restricted stock unit ("RSU") activity under the 2014 Plan and 2015 Plan for the years ended December 31, 2019, is summarized as follows:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Non-vested at December 31, 2018 |  |  | 111,891 |  |  | $ | 2.06 |
Granted |  |  | 932,500 |  |  |  | 1.37 |
Vested |  |  | (29,673 | ) |  |  | 2.14 |
Forfeited |  |  | (48,324 | ) |  |  | 1.46 |
Non-vested at December 31, 2019 |  |  | 966,394 |  |  | $ | 1.42 |
Stock-Based Compensation Expense Related to Stock Options | Stock-based compensation expense related to stock options is included in the following line items in the accompanying statements of operations (in thousands):
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |
Research and development |  | $ | 604 |  |  | $ | 519 |
Selling, general and administrative |  |  | 1,224 |  |  |  | 1,297 |
Total stock-based compensation expense |  | $ | 1,828 |  |  | $ | 1,816 |

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- 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
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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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