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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Preferred Stock [Member] | Common Stock | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2018 |  | $ 23 | $ 53,796 | $ (47,696) | $ 6,123
Balance at beginning of period (in shares) at Dec. 31, 2018 | 47 | 2,298,738 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (1,652) | (1,652)
Conversion of convertible notes into common stock |  | $ 12 | 3,114 |  | 3,126
Conversion of convertible notes into common stock (in shares) |  | 1,248,115 |  |  |
Issuance of common stock in connection with purchase agreements |  | $ 8 | 1,718 |  | 1,726
Issuance of common stock in connection with purchase agreements (in shares) |  | 758,076 |  |  |
Write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions |  |  | 315 |  | 315
Write-off debt derivative liability in conjunction with convertible note conversions |  |  | 39 |  | 39
Sock-based compensation |  |  | 156 |  | 156
Balance at end of period at Mar. 31, 2019 |  | $ 43 | 59,138 | (49,348) | 9,833
Balance at end of period (in shares) at Mar. 31, 2019 | 47 | 4,304,929 |  |  |
Balance at beginning of period at Dec. 31, 2018 |  | $ 23 | 53,796 | (47,696) | 6,123
Balance at beginning of period (in shares) at Dec. 31, 2018 | 47 | 2,298,738 |  |  |
Balance at end of period at Dec. 31, 2019 |  | $ 79 | 74,065 | (60,939) | 13,205
Balance at end of period (in shares) at Dec. 31, 2019 | 47 | 7,898,117 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (3,205) | (3,205)
Conversion of convertible notes into common stock |  | $ 4 | 349 |  | 353
Conversion of convertible notes into common stock (in shares) |  | 427,997 |  |  |
Issuance of common stock in connection with purchase agreements |  | $ 12 | 1,338 |  | 1,350
Issuance of common stock in connection with purchase agreements (in shares) |  | 1,180,012 |  |  |
Write-off beneficial conversion feature in conjunction with convertible note extinguishment |  |  | (523) |  | (523)
Write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions |  |  | (63) |  | (63)
Sock-based compensation |  |  | 168 |  | 168
Balance at end of period at Mar. 31, 2020 |  | $ 95 | $ 75,334 | $ (64,144) | $ 11,285
Balance at end of period (in shares) at Mar. 31, 2020 | 47 | 9,506,126 |  |  |

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