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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Restructuring Liability [Member] Additional Paid-in Capital [Member] | Restructuring Liability [Member] | Side Warrants [Member] Additional Paid-in Capital [Member] | Side Warrants [Member] | Note Conversion Warrants Common Stock | Note Conversion Warrants Additional Paid-in Capital [Member] | Note Conversion Warrants | Note Default [Member] Additional Paid-in Capital [Member] | Note Default [Member] | Preferred Stock [Member] Preferred Stock [Member] | Preferred Stock [Member] | Common Stock Common Stock | Common Stock | Additional Paid-in Capital [Member] Common Stock | Additional Paid-in Capital [Member] Preferred Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Common Stock | Preferred Stock [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  | $ 8 |  | $ 4 |  |  | $ 4,376 | $ (10,848) |  |  | $ (6,460)
Balance at beginning of period (in shares) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  | 780,105 |  | 449,175 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,694) |  |  | (20,694)
Conversion of warrants into stock |  |  |  |  |  |  |  |  |  |  |  | $ 20 |  | $ (20) | $ 25 |  |  |  | $ 25 |
Conversion of warrants into stock (in shares) |  |  |  |  |  |  |  |  |  | 8,542 |  | 1,958,166 |  |  |  |  |  |  |  |
Shares converted, value |  |  |  |  |  |  |  |  |  |  | $ (25) |  | $ 42 |  |  | (17) |  |  |  |
Conversion of preferred stock into common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (2,527,879) |  | 4,217,408 |  |  |  |  |  |  |
Conversion of debt into stock |  |  |  |  | $ 6 | $ 2,732 | $ 2,738 |  |  |  | $ 8 |  | $ 14 |  |  | 4,749 |  |  |  | 4,771
Conversion of debt into stock (in shares) |  |  |  |  | 515,638 |  |  |  |  |  | 802,920 |  | 1,414,700 |  |  |  |  |  |  |
Issuance of common stock for consulting services in connection with the merger |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 |  |  | 2,186 |  |  |  | 2,189
Issuance of common stock for consulting services in connection with the merger (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 321,821 |  |  |  |  |  |  |
Shares issued in connection with business combination |  |  |  |  |  |  |  |  |  |  | $ 8 |  | $ 12 |  |  | 20,078 |  |  |  | 20,098
Shares issued in connection with business combination (in shares) |  |  |  |  |  |  |  |  |  |  | 802,925 |  | 1,255,119 |  |  |  |  |  |  |
Issuance of preferred stock |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  |  |  | 7,783 |  |  |  | 7,784
Issuance of preferred stock (in shares) |  |  |  |  |  |  |  |  |  |  | 138,322 |  |  |  |  |  |  |  |  |
Issuance of warrants in conjunction with issuance of side agreement | $ 159 | $ 159 | $ 487 | $ 487 |  |  |  | $ 15 | $ 15 |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature on issuance of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,856 |  |  |  | 1,856
Non-cash stock-based compensation and vesting of restricted units |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  | 56 |  |  |  | 57
Non-cash stock-based compensation and vesting of restricted units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 64,593 |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  | $ 102 |  |  | 44,465 | (31,542) |  |  | 13,025
Balance at end of period (in shares) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  | 4,935 |  | 10,196,620 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,694) |  |  | (15,694)
Shares converted, value |  |  |  |  |  |  |  |  |  |  |  |  | $ 65 |  |  | (65) |  |  |  |
Conversion of preferred stock into common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (4,888) |  | 6,465,334 |  |  |  |  |  |  |
Conversion of debt into stock |  |  |  |  |  |  |  |  |  |  |  | $ 58 |  | $ 2,298 |  |  |  | $ 2,356 |  |
Conversion of debt into stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | 5,773,439 |  |  |  |  |  | 3,787,300 |  |
Issuance of common stock in connection with purchase agreements |  |  |  |  |  |  |  |  |  |  |  |  | $ 64 |  |  | 1,944 |  |  |  | 2,008
Issuance of common stock in connection with purchase agreements (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 6,420,723 |  |  |  |  |  |  |
Issuance of common stock in exchange for cancelation of other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  | $ 18 |  |  | 1,879 |  |  |  | 1,897
Issuance of common stock in exchange for cancelation of other current liabilities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,814,754 |  |  |  |  |  |  |
Issuance of common stock upon exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ 38 |  |  | 1,233 |  |  |  | 1,271
Issuance of common stock upon exercise of warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,787,300 |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  | 22,913 |  |  |  |  |  |  |
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 and vesting of restricted units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 490 |  |  |  | 490
Balance at end of period at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  | $ 345 |  |  | $ 53,474 | $ (47,696) |  |  | $ 6,123
Balance at end of period (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  | 47 |  | 34,481,083 |  |  |  |  |  |  |

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