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v3.19.1

Notes Payable (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Instrument [Line Items] |
Components of Notes Payable and Long-Term Debt | The components of notes payable and long-term debt at December 31, 2018 and 2017 are as follows:
| 2018 |  |  | 2017 |
| (In thousands) |
Short-term note payable | $ | 202 |  |  | $ | 203 |
Current portion of long-term notes payable |  | - |  |  |  | 270 |
Long-term notes payable |  | - |  |  |  | 6,230 |
Principal balance of notes payable |  | 202 |  |  |  | 6,703 |
Warrants issued as part of debt refinancing |  | - |  |  |  | (365) |
Loan cost capitalization |  | - |  |  |  | (341) |
Total notes payable, net | $ | 202 |  |  | $ | 5,997 |
Warrant |
Debt Instrument [Line Items] |
Warrants Calculated Using the Black Scholes Merton Pricing Model | The fair value of the warrants was calculated using the Black Scholes-Merton pricing model using the following weighted average assumptions, at the grant date:
Number of warrants |  | 500,000 |
Exercise price | $ | 2.26 |
Expected volatility of underlying stock |  | 72 | %
Risk-free interest rate |  | 2.08 | %
Dividend yield |  | 0 | %
Expected life of warrants |  | 5 years |
Weighted-average fair value of warrants | $ | 0.73 |
Expiration date |  | November 13, 2022 |

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