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Consolidated Statements of Stockholder's Equity (Unaudited) - USD ($) | Total | LPC [Member] | December 2019 Financing [Member] | April 2020 Private Placement [Member] | July 2020 Registered Direct Offering [Member] | August 2020 Public Offering [Member] | October 2018 Financing [Member] | Cumulative Adjustment on Adoption of Lease Standard [Member] | Common stock [Member] | Common stock [Member] Series B Convertible Preferred Stock [Member] | Common stock [Member] LPC [Member] | Common stock [Member] April 2020 Private Placement [Member] | Common stock [Member] July 2020 Registered Direct Offering [Member] | Common stock [Member] August 2020 Public Offering [Member] | Preferred stock [Member] | Preferred stock [Member] Series B Convertible Preferred Stock [Member] | Additional paid-in capital [Member] | Additional paid-in capital [Member] Series B Convertible Preferred Stock [Member] | Additional paid-in capital [Member] LPC [Member] | Additional paid-in capital [Member] December 2019 Financing [Member] | Additional paid-in capital [Member] April 2020 Private Placement [Member] | Additional paid-in capital [Member] July 2020 Registered Direct Offering [Member] | Additional paid-in capital [Member] August 2020 Public Offering [Member] | Additional paid-in capital [Member] October 2018 Financing [Member] | Accumulated other comprehensive income (loss) [Member] | Accumulated deficit [Member] | Accumulated deficit [Member] Cumulative Adjustment on Adoption of Lease Standard [Member]
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Beginning Balance at Dec. 31, 2018 | $ 15,802,000 |  |  |  |  |  |  | $ (3,000) | $ 18,000 |  |  |  |  |  |  |  | $ 41,161,000 |  |  |  |  |  |  |  | $ 4,000 | $ (25,381,000) | $ (3,000)
Beginning Balance, Shares at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 336,055 |  |  |  |  |  | 579 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 290,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,000 |  |  |  |  |  |  |  |  |  |
Adjustments to final October 2018 financing costs |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |
Accounting Standards Update [Extensible List] |  |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (5,904,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,904,000) |
Ending Balance at Mar. 31, 2019 | 10,189,000 |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  | 41,455,000 |  |  |  |  |  |  |  | 4,000 | (31,288,000) |
Ending Balance, Shares at Mar. 31, 2019 |  |  |  |  |  |  |  |  | 336,059 |  |  |  |  |  | 579 |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 15,802,000 |  |  |  |  |  |  | $ (3,000) | $ 18,000 |  |  |  |  |  |  |  | 41,161,000 |  |  |  |  |  |  |  | 4,000 | (25,381,000) | $ (3,000)
Beginning Balance, Shares at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 336,055 |  |  |  |  |  | 579 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares | 256 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (13,201,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 | 8,141,000 |  |  |  |  |  |  |  | $ 19,000 |  |  |  |  |  |  |  | 50,628,000 |  |  |  |  |  |  |  | 4,000 | (42,510,000) |
Ending Balance, Shares at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 405,136 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2019 | 10,189,000 |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  | 41,455,000 |  |  |  |  |  |  |  | 4,000 | (31,288,000) |
Beginning Balance, Shares at Mar. 31, 2019 |  |  |  |  |  |  |  |  | 336,059 |  |  |  |  |  | 579 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 317,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 317,000 |  |  |  |  |  |  |  |  |  |
Shares issued |  | $ 423,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 423,000 |  |  |  |  |  |  |  |
Shares issued, Shares |  |  |  |  |  |  |  |  |  |  | 6,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on conversion of preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (579) |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on conversion of preferred shares, Shares |  |  |  |  |  |  |  |  | 7,237 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of warrants | 4,199,000 |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  | 4,198,000 |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of warrants, Shares |  |  |  |  |  |  |  |  | 55,390 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of inducement warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,925,000 |  |  |  |  |  |  |  |  | (3,925,000) |
Net loss | (3,624,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,624,000) |
Ending Balance at Jun. 30, 2019 | $ 11,504,000 |  |  |  |  |  |  |  | $ 19,000 |  |  |  |  |  |  |  | 50,318,000 |  |  |  |  |  |  |  | 4,000 | (38,837,000) |
Ending Balance, Shares at Jun. 30, 2019 |  |  |  |  |  |  |  |  | 404,886 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares | 256 |  |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 310,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,000 |  |  |  |  |  |  |  |  |  |
Net loss | (3,673,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,673,000) |
Ending Balance at Sep. 30, 2019 | 8,141,000 |  |  |  |  |  |  |  | $ 19,000 |  |  |  |  |  |  |  | 50,628,000 |  |  |  |  |  |  |  | 4,000 | (42,510,000) |
Ending Balance, Shares at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 405,136 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | 18,050,000 |  |  |  |  |  |  |  | $ 41,000 |  |  |  |  |  |  |  | 63,709,000 |  |  |  |  |  |  |  | 4,000 | (45,704,000) |
Beginning Balance, Shares at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 1,474,258 |  |  |  |  |  | 1,121 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 302,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 302,000 |  |  |  |  |  |  |  |  |  |
Costs relating to financing and purchase agreement |  | (13,000) | $ (34,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,000) | $ (34,000) |  |  |  |  |  |  |
Shares issued on conversion of preferred shares |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  | $ (2,000) |  |  |  |  |  |  |  |  |
Shares issued on conversion of preferred shares, Shares |  |  |  |  |  |  |  |  |  | 93,379 |  |  |  |  |  | (1,121) |  |  |  |  |  |  |  |  |  |  |
Net loss | (3,320,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,320,000) |
Ending Balance at Mar. 31, 2020 | 14,985,000 |  |  |  |  |  |  |  | $ 43,000 |  |  |  |  |  |  |  | 63,962,000 |  |  |  |  |  |  |  | 4,000 | (49,024,000) |
Ending Balance, Shares at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 1,567,637 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2019 | $ 18,050,000 |  |  |  |  |  |  |  | $ 41,000 |  |  |  |  |  |  |  | 63,709,000 |  |  |  |  |  |  |  | 4,000 | (45,704,000) |
Beginning Balance, Shares at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 1,474,258 |  |  |  |  |  | 1,121 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares | 236 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (10,006,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 | 25,675,000 |  |  |  |  |  |  |  | $ 74,000 |  |  |  |  |  |  |  | 81,307,000 |  |  |  |  |  |  |  | 4,000 | (55,710,000) |
Ending Balance, Shares at Sep. 30, 2020 |  |  |  |  |  |  |  |  | 3,616,414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2020 | 14,985,000 |  |  |  |  |  |  |  | $ 43,000 |  |  |  |  |  |  |  | 63,962,000 |  |  |  |  |  |  |  | 4,000 | (49,024,000) |
Beginning Balance, Shares at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 1,567,637 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 308,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 308,000 |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | $ 1,579,000 |  |  |  |  |  |  |  | $ 6,000 |  |  |  |  |  |  |  |  | $ 1,573,000 |  |  |  |  |  |
Shares issued, Shares |  |  |  |  |  |  |  |  |  |  |  | 280,782 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs relating to financing and purchase agreement |  | $ (1,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,000) |  |  |  |  |  |  |  |
Shares issued on conversion of preferred shares |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  | (2,000) |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of warrants | 589,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 589,000 |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of warrants, Shares |  |  |  |  |  |  |  |  | 89,281 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of fractional shares on reverse stock split |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (2,922,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,922,000) |
Ending Balance at Jun. 30, 2020 | $ 14,538,000 |  |  |  |  |  |  |  | $ 51,000 |  |  |  |  |  |  |  | 66,429,000 |  |  |  |  |  |  |  | 4,000 | (51,946,000) |
Ending Balance, Shares at Jun. 30, 2020 |  |  |  |  |  |  |  |  | 1,937,703 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settlements, Shares | 236 |  |  |  |  |  |  |  | 128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 281,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 281,000 |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  | $ 5,307,000 | $ 6,822,000 |  |  |  |  |  |  | $ 15,000 | $ 1,000 |  |  |  |  |  |  |  | $ 5,292,000 | $ 6,821,000 |  |  |  |
Shares issued, Shares |  |  |  |  |  |  |  |  |  |  |  |  | 731,707 | 569,043 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of warrants | 2,491,000 |  |  |  |  |  |  |  | $ 7,000 |  |  |  |  |  |  |  | 2,484,000 |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of warrants, Shares |  |  |  |  |  |  |  |  | 377,845 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of fractional shares on reverse stock split |  |  |  |  |  |  |  |  | (12) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (3,764,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,764,000) |
Ending Balance at Sep. 30, 2020 | $ 25,675,000 |  |  |  |  |  |  |  | $ 74,000 |  |  |  |  |  |  |  | $ 81,307,000 |  |  |  |  |  |  |  | $ 4,000 | $ (55,710,000) |
Ending Balance, Shares at Sep. 30, 2020 |  |  |  |  |  |  |  |  | 3,616,414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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