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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) | Common Stock | Additional Paid- in Capital | Accumulated Deficit | Total
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 45,440 | $ 365,400,748 | $ (306,105,450) | $ 59,340,738
Beginning Balance (in shares) at Dec. 31, 2018 | 45,440,704 |  |  |
Stock options exercised for cash | $ 12 | 57,732 | 0 | 57,744
Stock options exercised for cash (in shares) | 11,980 |  |  |
Warrants exercised for cash | $ 2 | 5,377 | 0 | 5,379
Warrants exercised for cash (in shares) | 1,799 |  |  |
Stock-based compensation | $ 59 | 2,889,184 | 0 | 2,889,243
Stock-based compensation (in shares) | 59,040 |  |  |
Net loss | $ 0 | 0 | (10,889,316) | (10,889,316)
Ending Balance at Jun. 30, 2019 | $ 45,513 | 368,353,041 | (316,994,766) | 51,403,788
Ending Balance (in shares) at Jun. 30, 2019 | 45,513,523 |  |  |
Beginning Balance at Mar. 31, 2019 | $ 45,484 | 366,989,803 | (311,424,375) | 55,610,912
Beginning Balance (in shares) at Mar. 31, 2019 | 45,484,483 |  |  |
Stock-based compensation | $ 29 | 1,363,238 | 0 | 1,363,267
Stock-based compensation (in shares) | 29,040 |  |  |
Net loss | $ 0 | 0 | (5,570,391) | (5,570,391)
Ending Balance at Jun. 30, 2019 | $ 45,513 | 368,353,041 | (316,994,766) | 51,403,788
Ending Balance (in shares) at Jun. 30, 2019 | 45,513,523 |  |  |
Beginning Balance at Dec. 31, 2019 | $ 45,728 | 371,573,909 | (327,533,414) | 44,086,223
Beginning Balance (in shares) at Dec. 31, 2019 | 45,728,831 |  |  |
Warrants exercised for cash | $ 459 | 549,541 | 0 | 550,000
Warrants exercised for cash (in shares) | 458,334 |  |  |
Issuance of common stock as commitment fee for future financing | $ 345 | (345) | 0 |
Issuance of common stock as commitment fee for future financing (Shares) | 345,357 |  |  |
Stock-based compensation | $ 85 | 2,705,280 | 0 | 2,705,365
Stock-based compensation (in shares) | 85,110 |  |  |
Net loss | $ 0 | 0 | (12,827,343) | (12,827,343)
Ending Balance at Jun. 30, 2020 | $ 46,617 | 374,828,385 | (340,360,757) | 34,514,245
Ending Balance (in shares) at Jun. 30, 2020 | 46,617,632 |  |  |
Beginning Balance at Mar. 31, 2020 | $ 46,532 | 373,467,697 | (334,019,058) | 39,495,171
Beginning Balance (in shares) at Mar. 31, 2020 | 46,532,522 |  |  |
Stock-based compensation | $ 85 | 1,360,688 | 0 | 1,360,773
Stock-based compensation (in shares) | 85,110 |  |  |
Net loss | $ 0 | 0 | (6,341,699) | (6,341,699)
Ending Balance at Jun. 30, 2020 | $ 46,617 | $ 374,828,385 | $ (340,360,757) | $ 34,514,245
Ending Balance (in shares) at Jun. 30, 2020 | 46,617,632 |  |  |

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