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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 426 | $ 115,719 | $ (46,932) | $ 69,213
Balance (in shares) at Dec. 31, 2018 | 42,602,431 |  |  |
Issuance of common stock upon exercise of stock options |  | 9 |  | 9
Issuance of common stock upon exercise of stock options (in shares) | 10,000 |  |  |
Issuance of common stock for services |  | 10 |  | 10
Issuance of common stock for services (in shares) | 16,129 |  |  |
Stock compensation expense |  | 890 |  | 890
Net income (loss) |  |  | (15,169) | (15,169)
Balance at Sep. 30, 2019 | $ 426 | 116,628 | (62,101) | 54,953
Balance (in shares) at Sep. 30, 2019 | 42,628,560 |  |  |
Balance at Dec. 31, 2018 | $ 426 | 115,719 | (46,932) | $ 69,213
Balance (in shares) at Dec. 31, 2018 | 42,602,431 |  |  |
Issuance of common stock upon exercise of stock options (in shares) |  |  |  | 10,000
Balance at Dec. 31, 2019 | $ 426 | 117,557 | (72,872) | $ 45,111
Balance (in shares) at Dec. 31, 2019 | 42,628,560 |  |  |
Balance at Jun. 30, 2019 | $ 426 | 116,356 | (64,768) | 52,014
Balance (in shares) at Jun. 30, 2019 | 42,612,431 |  |  |
Issuance of common stock upon exercise of stock options |  | 10 |  | 10
Issuance of common stock upon exercise of stock options (in shares) | 16,129 |  |  |
Stock compensation expense |  | 262 |  | 262
Net income (loss) |  |  | 2,667 | 2,667
Balance at Sep. 30, 2019 | $ 426 | 116,628 | (62,101) | 54,953
Balance (in shares) at Sep. 30, 2019 | 42,628,560 |  |  |
Balance at Dec. 31, 2019 | $ 426 | 117,557 | (72,872) | 45,111
Balance (in shares) at Dec. 31, 2019 | 42,628,560 |  |  |
Issuance of common stock for services |  | 35 |  | 35
Issuance of common stock for services (in shares) | 35,714 |  |  |
Stock compensation expense | $ 0 | 524 | 0 | 524
Stock compensation expense (in shares) | 0 |  |  |
Net income (loss) |  |  | (460) | (460)
Balance at Sep. 30, 2020 | $ 426 | 118,116 | (73,332) | 45,210
Balance (in shares) at Sep. 30, 2020 | 42,664,274 |  |  |
Balance at Jun. 30, 2020 | $ 426 | 117,890 | (73,371) | 44,945
Balance (in shares) at Jun. 30, 2020 | 42,628,560 |  |  |
Issuance of common stock for services |  | 35 |  | 35
Issuance of common stock for services (in shares) | 35,714 |  |  |
Stock compensation expense |  | 191 |  | 191
Net income (loss) |  |  | 39 | 39
Balance at Sep. 30, 2020 | $ 426 | $ 118,116 | $ (73,332) | $ 45,210
Balance (in shares) at Sep. 30, 2020 | 42,664,274 |  |  |

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