| 1 1 . | Income Taxes |
| Year Ended | ||||||||
| December 31, | ||||||||
| 2017 | 2016 | |||||||
| Income tax provision (benefit) at statutory rate | (34 | )% | (34 | )% | ||||
| State income taxes, net of federal benefit | (4 | )% | (2 | )% | ||||
| Change in valuation allowance | 4 | % | 33 | % | ||||
| Effect of tax legislation | 33 | % | 0 | % | ||||
| Other | 1 | % | 3 | % | ||||
| Effective tax rate | 0 | % | 0 | % | ||||
| December 31, | ||||||||
| 2017 | 2016 | |||||||
| Deferred tax assets: | ||||||||
| Net operating loss carryforwards | $ | 19,699 | $ | 16,888 | ||||
| Capitalized start up costs | 3,963 | 5,944 | ||||||
| Research and development credits | 835 | 518 | ||||||
| Accruals and reserves | 1,403 | 1,095 | ||||||
| Fixed assets and depreciation | 39 | - | ||||||
| Total deferred tax assets | 25,939 | 24,445 | ||||||
| Deferred tax liabilities: | ||||||||
| Fixed assets and depreciation | - | (7 | ) | |||||
| Valuation allowance | (25,939 | ) | (24,438 | ) | ||||
| Net deferred tax assets | $ | - | $ | - | ||||
| Year Ended | ||||||||
| December 31, | ||||||||
| 2017 | 2016 | |||||||
| Balance at the beginning of the year | $ | 268 | $ | 128 | ||||
| Additions based upon tax positions related to the current year | 129 | 140 | ||||||
| Balance at the end of the year | $ | 397 | $ | 268 | ||||