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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] | Common Stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 |  | $ 7 | $ 44,560 | $ (31,542) |  | $ 13,025
Balance at beginning of period (in shares) at Dec. 31, 2017 | 4,935 | 679,774 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss |  |  |  | (15,694) |  | (15,694)
Conversion of preferred stock into common stock |  | $ 4 | (4) |  |  |
Conversion of preferred stock into common stock (in shares) | (4,888) | 431,022 |  |  |  |
Conversion of convertible notes into common stock |  | $ 4 | 2,352 |  |  | 2,356
Conversion of convertible notes into common stock (in shares) |  | 384,896 |  |  | 252,486 |
Issuance of common stock in connection with purchase agreements |  | $ 5 | 2,003 |  |  | 2,008
Issuance of common stock in connection with purchase agreements (in shares) |  | 428,050 |  |  |  |
Issuance of common stock in exchange for cancelation of other current liabilities |  | $ 1 | 1,896 |  |  | 1,897
Issuance of common stock in exchange for cancelation of other current liabilities (in shares) |  | 120,983 |  |  |  |
Issuance of common stock upon exercise of warrants |  | $ 2 | 1,269 |  |  | 1,271
Issuance of common stock upon exercise of warrants (in shares) |  | 252,486 |  |  |  |
Issuance of common stock for consulting services in connection with the merger |  |  | 39 |  |  | 39
Issuance of common stock for consulting services in connection with the merger (in shares) |  | 1,527 |  |  |  |
Warrant modification recorded as debt discount in conjunction with convertible note issuance |  |  | 11 |  |  | 11
Beneficial conversion feature on issuance of notes |  |  | 2,118 |  |  | 2,118
Write-off beneficial conversion feature in conjunction with convertible note extinguishment |  |  | (1,029) |  |  | (1,029)
Write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions |  |  | (210) |  |  | (210)
Write-off debt derivative liability in conjunction with convertible note conversions |  |  | 301 |  |  | 301
Liability recorded related to equity purchase agreement repricing |  |  |  | (460) |  | (460)
Non-cash stock-based compensation |  |  | 490 |  |  | 490
Balance at end of period at Dec. 31, 2018 |  | $ 23 | 53,796 | (47,696) |  | 6,123
Balance at end of period (in shares) at Dec. 31, 2018 | 47 | 2,298,738 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss |  |  |  | (13,243) |  | (13,243)
Conversion of convertible notes into common stock |  | $ 25 | 7,528 |  |  | 7,553
Conversion of convertible notes into common stock (in shares) |  | 2,511,173 |  |  | 310,200 |
Issuance of common stock in connection with purchase agreements |  | $ 28 | 6,600 |  |  | 6,628
Issuance of common stock in connection with purchase agreements (in shares) |  | 2,778,077 |  |  |  |
Proceeds upon issuance of common stock from exercise of warrants |  | $ 3 | 1,572 |  |  | 1,575
Write-off warrant liability in conjunction with warrant exercises |  |  | 2,364 |  |  | 2,364
Issuance of common stock upon exercise of warrants (in shares) |  | 310,200 |  |  |  |
Beneficial conversion feature on issuance of notes |  |  | 1,792 |  |  | 1,792
Write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions |  |  | (731) |  |  | (731)
Write-off debt derivative liability in conjunction with convertible note conversions |  |  | 477 |  |  | 477
Non-cash stock-based compensation |  |  | 668 |  |  | 668
Payment of fractional common shares in conjunction with reverse stock split |  |  | (1) |  |  | (1)
Payment of fractional common shares in conjunction with reverse stock split (in shares) |  | (71) |  |  |  |
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 |  |  |  |

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