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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Schedule of the allocation of stock-based compensation | The stock-based compensation expense was allocated as follows:
| Three months ended June 30, |  |  |  | Six months ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Cost of product sales | $ | 22 |  |  | $ | 17 |  |  | $ | 44 |  |  | $ | 92 |
Research and development cost | 15 |  |  | 19 |  |  | 120 |  |  | 134 |
General and administrative expense | 517 |  |  | 894 |  |  | 1,346 |  |  | 1,772 |
Total | $ | 554 |  |  | $ | 930 |  |  | $ | 1,510 |  |  | $ | 1,998 |
Schedule of assumptions used in the Black-Scholes-Merton option-pricing model | The following assumptions were used in the Black-Scholes-Merton pricing model to estimate the fair value of options granted during the periods presented. There were no options issued during the three and six months ended June 30, 2020:
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  |  | 2019 |  |  | 2019
Expected stock volatility |  |  | 86.3% - 87.5% |  |  | 82.3% - 87.5%
Risk free interest rate |  |  | 2.2% - 2.3% |  |  | 2.2% - 2.5%
Expected years until exercise |  |  | 2.8 - 3.4 |  |  | 2.2 - 2.5
Dividend yield |  |  | 0 | % |  |  | 0 | %

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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 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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