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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Series A Convertible Preferred Stock | Series B Convertible Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ (26,369) | $ 3 |  |  | $ 13,691 | $ (39,111) | $ (952)
Beginning balance, Shares at Dec. 31, 2017 |  | 25,650,000 |  | 16,496,801 |  |  |
Stock option exercises | 20 |  |  |  | 20 |  |
Stock option exercises, Shares |  |  |  | 29,802 |  |  |
Share-based compensation expense | 151 |  |  |  | 189 | (38) |
Net loss | (9,012) |  |  |  |  | (9,012) |
Ending balance at Mar. 31, 2018 | (35,210) | $ 3 |  |  | 13,900 | (48,161) | (952)
Ending balance, Shares at Mar. 31, 2018 |  | 25,650,000 |  | 16,526,603 |  |  |
Beginning balance at Dec. 31, 2017 | (26,369) | $ 3 |  |  | 13,691 | (39,111) | (952)
Beginning balance, Shares at Dec. 31, 2017 |  | 25,650,000 |  | 16,496,801 |  |  |
Net loss | (30,594) |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 53,586 | $ 3 | $ 2 |  | 124,276 | (69,743) | (952)
Ending balance, Shares at Sep. 30, 2018 |  | 25,650,000 | 21,956,095 | 16,636,815 |  |  |
Beginning balance at Mar. 31, 2018 | (35,210) | $ 3 |  |  | 13,900 | (48,161) | (952)
Beginning balance, Shares at Mar. 31, 2018 |  | 25,650,000 |  | 16,526,603 |  |  |
Issuance of Series B convertible preferred stock, net of issuance costs | 87,826 |  | $ 2 |  | 87,824 |  |
Issuance of Series B convertible preferred stock, net of issuance costs, shares |  |  | 17,579,843 |  |  |  |
Stock option exercises | 62 |  |  |  | 62 |  |
Stock option exercises, Shares |  |  |  | 65,449 |  |  |
Share-based compensation expense | 254 |  |  |  | 254 |  |
Net loss | (11,826) |  |  |  |  | (11,826) |
Ending balance at Jun. 30, 2018 | 41,106 | $ 3 | $ 2 |  | 102,040 | (59,987) | (952)
Ending balance, Shares at Jun. 30, 2018 |  | 25,650,000 | 17,579,843 | 16,592,052 |  |  |
Issuance of Series B convertible preferred stock, net of issuance costs | 21,917 |  |  |  | 21,917 |  |
Issuance of Series B convertible preferred stock, net of issuance costs, shares |  |  | 4,376,252 |  |  |  |
Stock option exercises | 27 |  |  |  | 27 |  |
Stock option exercises, Shares |  |  |  | 44,763 |  |  |
Share-based compensation expense | 292 |  |  |  | 292 |  |
Net loss | (9,756) |  |  |  |  | (9,756) |
Ending balance at Sep. 30, 2018 | 53,586 | $ 3 | $ 2 |  | 124,276 | (69,743) | (952)
Ending balance, Shares at Sep. 30, 2018 |  | 25,650,000 | 21,956,095 | 16,636,815 |  |  |
Beginning balance at Dec. 31, 2018 | 39,960 | $ 3 | $ 2 |  | 126,094 | (85,187) | (952)
Beginning balance, Shares at Dec. 31, 2018 |  | 25,650,000 | 21,956,095 | 16,717,117 |  |  |
Adjustment to beginning accumulated deficit from adoption of ASU 2014-09 at Dec. 31, 2018 | 997 |  |  |  |  | 997 |
Stock option exercises | 107 |  |  |  | 107 |  |
Stock option exercises, Shares |  |  |  | 145,975 |  |  |
Share-based compensation expense | 1,549 |  |  |  | 1,549 |  |
Net loss | (31,783) |  |  |  |  | (31,783) |
Ending balance at Mar. 31, 2019 | 10,830 | $ 3 | $ 2 |  | 127,750 | (115,973) | (952)
Ending balance, Shares at Mar. 31, 2019 |  | 25,650,000 | 21,956,095 | 16,863,092 |  |  |
Beginning balance at Dec. 31, 2018 | 39,960 | $ 3 | $ 2 |  | 126,094 | (85,187) | (952)
Beginning balance, Shares at Dec. 31, 2018 |  | 25,650,000 | 21,956,095 | 16,717,117 |  |  |
Adjustment to beginning accumulated deficit from adoption of ASU 2014-09 at Dec. 31, 2018 | $ 997 |  |  |  |  | 997 |
Stock option exercises, Shares | 445,408 |  |  |  |  |  |
Net loss | $ (71,961) |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 155,788 |  |  |  | 312,891 | (156,151) | (952)
Ending balance, Shares at Sep. 30, 2019 |  |  |  | 51,470,176 |  |  |
Beginning balance at Mar. 31, 2019 | 10,830 | $ 3 | $ 2 |  | 127,750 | (115,973) | (952)
Beginning balance, Shares at Mar. 31, 2019 |  | 25,650,000 | 21,956,095 | 16,863,092 |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering |  | $ (3) | $ (2) |  | 5 |  |
Conversion of convertible preferred stock into common stock upon initial public offering, shares |  | (25,650,000) | (21,956,095) | 22,301,190 |  |  |
Issuance of common stock upon conversion of convertible notes | 49,490 |  |  |  | 49,490 |  |
Issuance of common stock upon conversion of convertible notes, shares |  |  |  | 2,921,461 |  |  |
Issuance of common stock in initial public offering, net of discounts and issuance costs | 130,543 |  |  |  | 130,543 |  |
Issuance of common stock in initial public offering, net of discounts and issuance costs, shares |  |  |  | 9,085,000 |  |  |
Stock option exercises | 272 |  |  |  | 272 |  |
Stock option exercises, Shares |  |  |  | 230,272 |  |  |
Share-based compensation expense | 2,279 |  |  |  | 2,279 |  |
Net loss | (19,436) |  |  |  |  | (19,436) |
Ending balance at Jun. 30, 2019 | 173,978 |  |  |  | 310,339 | (135,409) | (952)
Ending balance, Shares at Jun. 30, 2019 |  |  |  | 51,401,015 |  |  |
Stock option exercises | 61 |  |  |  | 61 |  |
Stock option exercises, Shares |  |  |  | 69,161 |  |  |
Share-based compensation expense | 2,491 |  |  |  | 2,491 |  |
Net loss | (20,742) |  |  |  |  | (20,742) |
Ending balance at Sep. 30, 2019 | $ 155,788 |  |  |  | $ 312,891 | $ (156,151) | $ (952)
Ending balance, Shares at Sep. 30, 2019 |  |  |  | 51,470,176 |  |  |

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