Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) |
Total |
Initial Public Offering |
Initial Public Offering
Convertible Notes
|
Common Stock |
Common Stock
Initial Public Offering
|
Common Stock
Initial Public Offering
Convertible Notes
|
Additional Paid-in Capital |
Additional Paid-in Capital
Initial Public Offering
|
Additional Paid-in Capital
Initial Public Offering
Convertible Notes
|
Accumulated Deficit |
Series A Convertible Preferred Stock |
Series A Convertible Preferred Stock
Initial Public Offering
|
Series B Convertible Preferred Stock |
Series B Convertible Preferred Stock
Initial Public Offering
|
Series B-1 Convertible Preferred Stock |
Series B-1 Convertible Preferred Stock
Initial Public Offering
|
Series C Convertible Preferred Stock |
Series C Convertible Preferred Stock
Initial Public Offering
|
Series D Convertible Preferred Stock |
Series D Convertible Preferred Stock
Initial Public Offering
|
Series D-1 Convertible Preferred Stock |
Series D-1 Convertible Preferred Stock
Initial Public Offering
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Convertible Preferred Stock, Beginning Balance (shares) at Dec. 31, 2017 | 345,587 | 8,058,170 | 3,437,950 | 23,357,047 | 20,652,486 | 66,141,257 | ||||||||||||||||
| Convertible Preferred Stock, Beginning Balance at Dec. 31, 2017 | $ 61,847 | $ 842,845 | $ 359,593 | $ 5,547,841 | $ 4,838,379 | $ 31,359,632 | ||||||||||||||||
| Convertible Preferred Stock, Ending Balance (shares) at Mar. 31, 2018 | 345,587 | 8,058,170 | 3,437,950 | 23,357,047 | 20,652,486 | 66,141,257 | ||||||||||||||||
| Convertible Preferred Stock, Ending Balance at Mar. 31, 2018 | $ 61,847 | $ 842,845 | $ 359,593 | $ 5,547,841 | $ 4,838,379 | $ 31,359,632 | ||||||||||||||||
| Beginning Balance (shares) at Dec. 31, 2017 | 77,257 | |||||||||||||||||||||
| Beginning Balance at Dec. 31, 2017 | $ (50,227,211) | $ 8 | $ 4,038,817 | $ (54,266,036) | ||||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 237 | |||||||||||||||||||||
| Stock option exercises | 305 | 305 | ||||||||||||||||||||
| Stock-based compensation expense | 54,444 | 54,444 | ||||||||||||||||||||
| Net loss | (3,847,362) | (3,847,362) | ||||||||||||||||||||
| Ending Balance (shares) at Mar. 31, 2018 | 77,494 | |||||||||||||||||||||
| Ending Balance at Mar. 31, 2018 | (54,019,824) | $ 8 | 4,093,566 | (58,113,398) | ||||||||||||||||||
| Convertible Preferred Stock, Beginning Balance (shares) at Dec. 31, 2017 | 345,587 | 8,058,170 | 3,437,950 | 23,357,047 | 20,652,486 | 66,141,257 | ||||||||||||||||
| Convertible Preferred Stock, Beginning Balance at Dec. 31, 2017 | $ 61,847 | $ 842,845 | $ 359,593 | $ 5,547,841 | $ 4,838,379 | $ 31,359,632 | ||||||||||||||||
| Beginning Balance (shares) at Dec. 31, 2017 | 77,257 | |||||||||||||||||||||
| Beginning Balance at Dec. 31, 2017 | (50,227,211) | $ 8 | 4,038,817 | (54,266,036) | ||||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 1,856 | |||||||||||||||||||||
| Net loss | (12,084,936) | |||||||||||||||||||||
| Ending Balance (shares) at Sep. 30, 2018 | 10,032,687 | |||||||||||||||||||||
| Ending Balance at Sep. 30, 2018 | 15,235,023 | $ 1,002 | 81,584,992 | (66,350,971) | ||||||||||||||||||
| Convertible Preferred Stock, Beginning Balance (shares) at Mar. 31, 2018 | 345,587 | 8,058,170 | 3,437,950 | 23,357,047 | 20,652,486 | 66,141,257 | ||||||||||||||||
| Convertible Preferred Stock, Beginning Balance at Mar. 31, 2018 | $ 61,847 | $ 842,845 | $ 359,593 | $ 5,547,841 | $ 4,838,379 | $ 31,359,632 | ||||||||||||||||
| Convertible Preferred Stock, Ending Balance (shares) at Jun. 30, 2018 | 345,587 | 8,058,170 | 3,437,950 | 23,357,047 | 20,652,486 | 66,141,257 | ||||||||||||||||
| Convertible Preferred Stock, Ending Balance at Jun. 30, 2018 | $ 61,847 | $ 842,845 | $ 359,593 | $ 5,547,841 | $ 4,838,379 | $ 31,359,632 | ||||||||||||||||
| Beginning Balance (shares) at Mar. 31, 2018 | 77,494 | |||||||||||||||||||||
| Beginning Balance at Mar. 31, 2018 | (54,019,824) | $ 8 | 4,093,566 | (58,113,398) | ||||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 551 | |||||||||||||||||||||
| Stock option exercises | 707 | 707 | ||||||||||||||||||||
| Stock-based compensation expense | 52,982 | 52,982 | ||||||||||||||||||||
| Net loss | (3,311,476) | (3,311,476) | ||||||||||||||||||||
| Ending Balance (shares) at Jun. 30, 2018 | 78,045 | |||||||||||||||||||||
| Ending Balance at Jun. 30, 2018 | (57,277,611) | $ 8 | 4,147,255 | (61,424,874) | ||||||||||||||||||
| Convertible Preferred Stock | ||||||||||||||||||||||
| Conversion of preferred stock upon IPO (shares) | (345,587) | (8,058,170) | (3,437,950) | (23,357,047) | (20,652,486) | (66,141,257) | ||||||||||||||||
| Conversion of preferred stock upon IPO | $ (61,847) | $ (842,845) | $ (359,593) | $ (5,547,841) | $ (4,838,379) | $ (31,359,632) | ||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 1,068 | |||||||||||||||||||||
| Stock option exercises | 2,487 | 2,487 | ||||||||||||||||||||
| Issue common stock (shares) | 3,864,000 | |||||||||||||||||||||
| Issue common stock | 19,389,978 | $ 386 | 19,389,592 | |||||||||||||||||||
| Conversion upon IPO ( shares) | 2,850,280 | 3,239,294 | ||||||||||||||||||||
| Conversion upon IPO | $ 43,010,137 | $ 14,898,327 | $ 285 | $ 323 | $ 43,009,852 | $ 14,898,004 | ||||||||||||||||
| Conversion of preferred stock warrants into common stock warrants | 84,676 | 84,676 | ||||||||||||||||||||
| Stock-based compensation expense | 53,126 | 53,126 | ||||||||||||||||||||
| Net loss | (4,926,097) | (4,926,097) | ||||||||||||||||||||
| Ending Balance (shares) at Sep. 30, 2018 | 10,032,687 | |||||||||||||||||||||
| Ending Balance at Sep. 30, 2018 | 15,235,023 | $ 1,002 | 81,584,992 | (66,350,971) | ||||||||||||||||||
| Beginning Balance (shares) at Dec. 31, 2018 | 10,055,072 | |||||||||||||||||||||
| Beginning Balance at Dec. 31, 2018 | 10,137,351 | $ 1,004 | 82,898,775 | (72,762,428) | ||||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 41,521 | |||||||||||||||||||||
| Stock option exercises | 53,976 | $ 4 | 53,972 | |||||||||||||||||||
| Issue common stock (shares) | 748,427 | |||||||||||||||||||||
| Issue common stock | 2,409,593 | $ 75 | 2,409,518 | |||||||||||||||||||
| Stock-based compensation expense | 289,395 | 289,395 | ||||||||||||||||||||
| Net loss | (7,851,743) | (7,851,743) | ||||||||||||||||||||
| Issue warrants for debt | 629,830 | 629,830 | ||||||||||||||||||||
| Issue stock for debt | 201,789 | 201,789 | ||||||||||||||||||||
| Ending Balance (shares) at Mar. 31, 2019 | 10,845,020 | |||||||||||||||||||||
| Ending Balance at Mar. 31, 2019 | 5,870,191 | $ 1,083 | 86,483,279 | (80,614,171) | ||||||||||||||||||
| Beginning Balance (shares) at Dec. 31, 2018 | 10,055,072 | |||||||||||||||||||||
| Beginning Balance at Dec. 31, 2018 | 10,137,351 | $ 1,004 | 82,898,775 | (72,762,428) | ||||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 50,047 | |||||||||||||||||||||
| Net loss | $ (21,914,475) | |||||||||||||||||||||
| ESPP Purchases (shares) | 66,155 | |||||||||||||||||||||
| Ending Balance (shares) at Sep. 30, 2019 | 10,897,522 | |||||||||||||||||||||
| Ending Balance at Sep. 30, 2019 | $ (7,378,516) | $ 1,088 | 87,297,299 | (94,676,903) | ||||||||||||||||||
| Beginning Balance (shares) at Mar. 31, 2019 | 10,845,020 | |||||||||||||||||||||
| Beginning Balance at Mar. 31, 2019 | 5,870,191 | $ 1,083 | 86,483,279 | (80,614,171) | ||||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 8,526 | |||||||||||||||||||||
| Stock option exercises | 11,084 | $ 1 | 11,083 | |||||||||||||||||||
| Stock-based compensation expense | 335,666 | 335,666 | ||||||||||||||||||||
| Net loss | (7,664,566) | (7,664,566) | ||||||||||||||||||||
| ESPP Purchases (shares) | 43,976 | |||||||||||||||||||||
| ESPP Purchases | 102,815 | $ 4 | 102,811 | |||||||||||||||||||
| Ending Balance (shares) at Jun. 30, 2019 | 10,897,522 | |||||||||||||||||||||
| Ending Balance at Jun. 30, 2019 | (1,344,810) | $ 1,088 | 86,932,839 | (88,278,737) | ||||||||||||||||||
| Equity | ||||||||||||||||||||||
| Stock option exercises (shares) | 0 | |||||||||||||||||||||
| Stock-based compensation expense | 364,460 | 364,460 | ||||||||||||||||||||
| Net loss | (6,398,166) | (6,398,166) | ||||||||||||||||||||
| Ending Balance (shares) at Sep. 30, 2019 | 10,897,522 | |||||||||||||||||||||
| Ending Balance at Sep. 30, 2019 | $ (7,378,516) | $ 1,088 | $ 87,297,299 | $ (94,676,903) |