| Share-based Payment Arrangement, Option, Activity [Table Text Block] |
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Outstanding Stock Options |
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Options Available for Grant |
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Number of Options Outstanding |
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Weighted
Average
Exercise Price
per Option |
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Weighted
Average Grant
Date Fair Value
per Option |
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Weighted
Average
Remaining
Exercise Term
in Months |
| Balance, December 31, 2017 |
4,145,774 |
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3,851,371 |
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$ |
3.11 |
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$ |
1.84 |
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43 |
| Granted |
(340,000) |
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340,000 |
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1.18 |
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0.54 |
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56 |
| Exercised |
— |
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(52,500) |
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1.24 |
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0.68 |
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— |
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| Forfeited |
— |
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— |
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— |
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— |
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— |
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| Expired |
— |
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(271,250) |
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3.22 |
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1.58 |
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— |
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| Balance, December 31, 2018 |
3,805,774 |
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3,867,621 |
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4.05 |
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$ |
1.84 |
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64 |
| Additional Shares Authorized under 2019 Plan |
8,000,000 |
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— |
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| Granted |
(2,400,000) |
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2,400,000 |
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0.96 |
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0.53 |
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81 |
| Exercised |
— |
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(498,552) |
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0.13 |
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1.92 |
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| Forfeited |
1,375,069 |
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(1,375,069) |
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4.75 |
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1.95 |
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27 |
| Expired |
— |
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— |
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| Balance, June 30, 2019 |
10,780,843 |
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4,394,000 |
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$ |
2.60 |
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$ |
1.32 |
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94 |
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