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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, 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 |  |  |  | (9,119) | (9,119)
Conversion of preferred stock into common stock (in shares) | (4,888) | 431,022 |  |  |
Conversion of convertible notes into common stock |  | $ 4 | (4) |  |
Conversion of convertible notes into common stock (in shares) |  | 252,486 |  |  |
Issuance of common stock in connection with purchase agreements |  | $ 2 | 616 |  | 618
Issuance of common stock in connection with purchase agreements (in shares) |  | 99,457 |  |  |
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 |  |  |
Beneficial conversion feature on issuance of notes |  |  | 1,604 |  | 1,604
Liability recorded related to equity purchase agreement repricing |  |  |  | (460) | (460)
Stock-based compensation |  |  | 342 |  | 342
Balance at end of period at Sep. 30, 2018 |  | $ 16 | 50,283 | (41,121) | 9,178
Balance at end of period (in shares) at Sep. 30, 2018 | 47 | 1,583,722 |  |  |
Balance at beginning of period at Jun. 30, 2018 |  | $ 15 | 49,455 | (37,272) | 12,198
Balance at beginning of period (in shares) at Jun. 30, 2018 | 47 | 1,503,969 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (3,849) | (3,849)
Conversion of convertible notes into common stock (in shares) |  | 39,753 |  |  |
Issuance of common stock in connection with purchase agreements |  | $ 1 | (1) |  |
Issuance of common stock in connection with purchase agreements (in shares) |  | 40,000 |  |  |
Issuance of common stock upon exercise of warrants |  |  | 179 |  | 179
Issuance of common stock upon exercise of warrants (in shares) |  | 39,753 |  |  |
Beneficial conversion feature on issuance of notes |  |  | 528 |  | 528
Stock-based compensation |  |  | 122 |  | 122
Balance at end of period at Sep. 30, 2018 |  | $ 16 | 50,283 | (41,121) | 9,178
Balance at end of period (in shares) at Sep. 30, 2018 | 47 | 1,583,722 |  |  |
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 |  |  |  | (9,462) | (9,462)
Conversion of convertible notes into common stock |  | $ 24 | 7,366 |  | 7,390
Conversion of convertible notes into common stock (in shares) |  | 2,439,173 |  |  |
Issuance of common stock in connection with purchase agreements |  | $ 21 | 5,150 |  | 5,171
Issuance of common stock in connection with purchase agreements (in shares) |  | 2,088,077 |  |  |
Write-off debt premiums (net of debt discounts) in conjunction with convertible note conversions |  |  | (590) |  | (590)
Write-off debt derivative liability in conjunction with convertible note conversions |  |  | 477 |  | 477
Proceeds upon issuance of common stock from exercise of warrants |  | $ 3 | 1,572 |  | 1,575
Proceeds upon issuance of common stock from exercise of warrants (in shares) |  | 310,200 |  |  |
Write-off warrant liability in conjunction with warrant exercises |  |  | 2,364 |  | 2,364
Beneficial conversion feature on issuance of notes |  |  | 1,792 |  | 1,792
Stock-based compensation |  |  | 455 |  | 455
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 Sep. 30, 2019 |  | $ 71 | 72,381 | (57,158) | 15,294
Balance at end of period (in shares) at Sep. 30, 2019 | 47 | 7,136,117 |  |  |
Balance at beginning of period at Jun. 30, 2019 |  | $ 60 | 69,428 | (55,261) | 14,227
Balance at beginning of period (in shares) at Jun. 30, 2019 | 47 | 5,993,369 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net loss |  |  |  | (1,897) | (1,897)
Conversion of convertible notes into common stock |  |  | 118 |  | 118
Conversion of convertible notes into common stock (in shares) |  | 52,748 |  |  |
Issuance of common stock in connection with purchase agreements |  | $ 11 | 2,750 |  | 2,761
Issuance of common stock in connection with purchase agreements (in shares) |  | 1,090,000 |  |  |
Write-off debt premiums (net of debt discounts) in conjunction with convertible note conversions |  |  | (63) |  | (63)
Stock-based compensation |  |  | 148 |  | 148
Balance at end of period at Sep. 30, 2019 |  | $ 71 | $ 72,381 | $ (57,158) | $ 15,294
Balance at end of period (in shares) at Sep. 30, 2019 | 47 | 7,136,117 |  |  |

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