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v3.19.3

Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | January 2019 Public Offering | May 2019 Public Offering | Over-Allotment Option | 2018 Public Offering | Officers and Directors Purchase Plan | Common Stock | Common Stock January 2019 Public Offering | Common Stock May 2019 Public Offering | Common Stock Over-Allotment Option | Common Stock 2018 Public Offering | Common Stock Officers and Directors Purchase Plan | Common Stock Restricted Stock Units (RSUs) | Additional Paid-in Capital | Additional Paid-in Capital January 2019 Public Offering | Additional Paid-in Capital May 2019 Public Offering | Additional Paid-in Capital Over-Allotment Option | Additional Paid-in Capital 2018 Public Offering | Additional Paid-in Capital Officers and Directors Purchase Plan | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  | 27,554,076 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 58,965 |  |  |  |  |  | $ 27 |  |  |  |  |  |  | $ 113,780 |  |  |  |  |  | $ (54,842)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 853 |  |  |  |  |  |  |  |  |  |  |  |  | 853 |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  |  |  | 1,072,500 | 10,085,500 | 2,034 | 65,600 |  |  |  |  |  |  |
Common stock issued during period |  |  |  | $ 2,103 | $ 26,647 | $ 4 |  |  |  | $ 2 | $ 10 |  |  |  |  |  | $ 2,101 | $ 26,637 | $ 4 |
Modification of Interstate Battery warrant 1 | 1,002 |  |  |  |  |  |  |  |  |  |  |  |  | 1,002 |  |  |  |  |  |
Net loss | (26,722) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26,722)
Ending balance (in shares) at Sep. 30, 2018 |  |  |  |  |  |  | 38,779,710 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 | 62,852 |  |  |  |  |  | $ 39 |  |  |  |  |  |  | 144,377 |  |  |  |  |  | (81,564)
Beginning balance (in shares) at Jun. 30, 2018 |  |  |  |  |  |  | 38,779,710 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2018 | 71,754 |  |  |  |  |  | $ 39 |  |  |  |  |  |  | 144,016 |  |  |  |  |  | (72,301)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 361 |  |  |  |  |  |  |  |  |  |  |  |  | 361 |  |  |  |  |  |
Net loss | (9,263) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,263)
Ending balance (in shares) at Sep. 30, 2018 |  |  |  |  |  |  | 38,779,710 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2018 | 62,852 |  |  |  |  |  | $ 39 |  |  |  |  |  |  | 144,377 |  |  |  |  |  | (81,564)
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | 38,932,437 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 50,090 |  |  |  |  |  | $ 39 |  |  |  |  |  |  | 145,147 |  |  |  |  |  | (95,096)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 2,899 |  |  |  |  |  |  |  |  |  |  |  |  | 2,899 |  |  |  |  |  |
Warrants related to Veolia agreement | 4,046 |  |  |  |  |  |  |  |  |  |  |  |  | 4,046 |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  | 5,175,000 | 11,000,000 |  |  |  | 448,487 |  |  |  |  |  |  |
Common stock issued during period |  | $ 9,063 | $ 20,317 |  |  |  |  | $ 5 | $ 11 |  |  |  |  |  | $ 9,058 | $ 20,306 |  |  |  |
Common stock issued for consulting services (in shares) |  |  |  |  |  |  | 1,736,950 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued for consulting services | 4,075 |  |  |  |  |  | $ 2 |  |  |  |  |  |  | 4,073 |  |  |  |  |  |
Net loss | (33,525) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (33,525)
Ending balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  | 57,292,874 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 | 56,965 |  |  |  |  |  | $ 57 |  |  |  |  |  |  | 185,529 |  |  |  |  |  | (128,621)
Beginning balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | 56,889,876 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2019 | 64,615 |  |  |  |  |  | $ 57 |  |  |  |  |  |  | 181,863 |  |  |  |  |  | (117,305)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 901 |  |  |  |  |  |  |  |  |  |  |  |  | 901 |  |  |  |  |  |
Warrants related to Veolia agreement | 1,734 |  |  |  |  |  |  |  |  |  |  |  |  | 1,734 |  |  |  |  |  |
Common stock issued during period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 91,319 |  |  |  |  |  |  |
Common stock issued for consulting services (in shares) |  |  |  |  |  |  | 311,679 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued for consulting services | 1,031 |  |  |  |  |  | $ 0 |  |  |  |  |  |  | 1,031 |  |  |  |  |  |
Net loss | (11,316) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,316)
Ending balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  | 57,292,874 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 | $ 56,965 |  |  |  |  |  | $ 57 |  |  |  |  |  |  | $ 185,529 |  |  |  |  |  | $ (128,621)

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