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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Shares outstanding, beginning balance (in shares) at Dec. 31, 2017 |  | 47,236,103 |  |
Beginning balance at Dec. 31, 2017 | $ 11,865,099 | $ 31,459 | $ 234,438,057 | $ (222,604,417)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of common stock (in shares) |  | 4,064,310 |  |
Issuance of common stock | $ 1,185,452 | $ 2,707 | 1,182,745 |
Common stock issuance costs (in shares) | 615,605 |  |  |
Common stock issuance costs | $ (52,568) | $ 410 | (52,978) |
Purchase of membership interest (in shares) |  | 1,475,410 |  |
Purchase of membership interests | 0 | $ 983 | (983) |
Net loss | (2,484,903) |  |  | (2,484,903)
Shares outstanding, ending balance (in shares) at Mar. 31, 2018 |  | 53,391,428 |  |
Ending balance at Mar. 31, 2018 | 10,513,080 | $ 35,559 | 235,566,841 | (225,089,320)
Shares outstanding, beginning balance (in shares) at Dec. 31, 2017 |  | 47,236,103 |  |
Beginning balance at Dec. 31, 2017 | 11,865,099 | $ 31,459 | 234,438,057 | (222,604,417)
Shares outstanding, ending balance (in shares) at Dec. 31, 2018 |  | 75,338,273 |  |
Ending balance at Dec. 31, 2018 | 9,384,902 | $ 50,175 | 241,419,897 | (232,085,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of common stock (in shares) |  | 5,452,000 |  |
Issuance of common stock | 813,561 | $ 3,631 | 809,930 |
Common stock issuance costs | (85,093) |  | (85,093) |
Net loss | (1,835,065) |  |  | (1,835,065)
Shares outstanding, ending balance (in shares) at Mar. 31, 2019 |  | 80,790,273 |  |
Ending balance at Mar. 31, 2019 | $ 8,278,305 | $ 53,806 | $ 242,144,734 | $ (233,920,235)

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