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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 |  |  |
Stock compensation expense |  | 628 |  | 628
Net loss |  |  | (17,836) | (17,836)
Balance at Jun. 30, 2019 | $ 426 | 116,356 | (64,768) | 52,014
Balance (in shares) at Jun. 30, 2019 | 42,612,431 |  |  |
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 Mar. 31, 2019 | $ 426 | 116,096 | (50,971) | 65,551
Balance (in shares) at Mar. 31, 2019 | 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 |  |  |
Stock compensation expense |  | 251 |  | 251
Net loss |  |  | (13,797) | (13,797)
Balance at Jun. 30, 2019 | $ 426 | 116,356 | (64,768) | 52,014
Balance (in shares) at Jun. 30, 2019 | 42,612,431 |  |  |
Balance at Dec. 31, 2019 | $ 426 | 117,557 | (72,872) | 45,111
Balance (in shares) at Dec. 31, 2019 | 42,628,560 |  |  |
Stock compensation expense | $ 0 | 333 | 0 | 333
Stock compensation expense (in shares) | 0 |  |  |
Net loss |  |  | (499) | (499)
Balance at Jun. 30, 2020 | $ 426 | 117,890 | (73,371) | 44,945
Balance (in shares) at Jun. 30, 2020 | 42,628,560 |  |  |
Balance at Mar. 31, 2020 | $ 426 | 117,682 | (75,757) | 42,351
Balance (in shares) at Mar. 31, 2020 | 42,628,560 |  |  |
Stock compensation expense |  | 208 |  | 208
Net loss |  |  | 2,386 | 2,386
Balance at Jun. 30, 2020 | $ 426 | $ 117,890 | $ (73,371) | $ 44,945
Balance (in shares) at Jun. 30, 2020 | 42,628,560 |  |  |

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