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Note 6 - Equity Incentive Plan (Tables) | 9 Months Ended
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Sep. 30, 2017
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Nine Months Ended September 30,
|  | 2017 |  | 2016
Risk-free interest rate |  |  | 1.60% | - | 1.78% |  |  |  | 0.94% | - | 1.40% |
Expected volatility |  |  | 41.36% | - | 44.30% |  |  |  | 48.84% | - | 51.61% |
Expected life (years) |  |  |  | 4.0 |  |  |  |  |  | 4.5 |  |
Expected dividend yield |  |  |  | 0.00% |  |  |  |  |  | 0.00% |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Cost of product revenue |  | $ | 107 |  |  | $ | 40 |  |  | $ | 306 |  |  | $ | 66 |
Research and development |  |  | 177 |  |  |  | 156 |  |  |  | 340 |  |  |  | 300 |
Selling, general and administrative |  |  | 1,190 |  |  |  | 601 |  |  |  | 3,294 |  |  |  | 1,910 |
Total stock-based compensation expense |  | $ | 1,474 |  |  | $ | 797 |  |  | $ | 3,940 |  |  | $ | 2,276 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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