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CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) - USD ($) $ in Thousands | Total | Convertible Preferred Stock | Common Stock | Common Stock IPO | Additional Paid-in Capital | Additional Paid-in Capital IPO | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2017 |  | 11,906,783 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2017 |  | $ 80,397 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2017 |  |  | $ 1 |  | $ 54,892 |  | $ (144,804)
Balance, shares at Dec. 31, 2017 |  |  | 1,027,113 |  |  |  |
Exercise of stock options |  |  |  |  | 11 |  |
Exercise of stock options, shares |  |  | 9,977 |  |  |  |
Employee and nonemployee stock-based compensation |  |  |  |  | 66 |  |
Net loss | $ (5,194) |  |  |  |  |  | (5,194)
Balance, shares at Jun. 30, 2018 |  | 11,906,783 |  |  |  |  |
Balance, at end of period at Jun. 30, 2018 |  | $ 80,397 |  |  |  |  |
Balance, at end of period at Jun. 30, 2018 | (95,028) |  | $ 1 |  | 54,969 |  | (149,998)
Balance, shares at Jun. 30, 2018 |  |  | 1,037,090 |  |  |  |
Balance, shares at Dec. 31, 2017 |  | 11,906,783 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2017 |  | $ 80,397 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2017 |  |  | $ 1 |  | 54,892 |  | (144,804)
Balance, shares at Dec. 31, 2017 |  |  | 1,027,113 |  |  |  |
Balance, at end of period at Dec. 31, 2018 | 5,129 |  | $ 15 |  | 148,641 |  | (143,527)
Balance, shares at Dec. 31, 2018 |  |  | 15,591,357 |  |  |  |
Balance, shares at Mar. 31, 2018 |  | 11,906,783 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2018 |  | $ 80,397 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2018 |  |  | $ 1 |  | 54,936 |  | (149,875)
Balance, shares at Mar. 31, 2018 |  |  | 1,035,570 |  |  |  |
Exercise of stock options, shares |  |  | 1,520 |  |  |  |
Employee and nonemployee stock-based compensation |  |  |  |  | 33 |  |
Net loss | (123) |  |  |  |  |  | (123)
Balance, shares at Jun. 30, 2018 |  | 11,906,783 |  |  |  |  |
Balance, at end of period at Jun. 30, 2018 |  | $ 80,397 |  |  |  |  |
Balance, at end of period at Jun. 30, 2018 | (95,028) |  | $ 1 |  | 54,969 |  | (149,998)
Balance, shares at Jun. 30, 2018 |  |  | 1,037,090 |  |  |  |
Balance, beginning of period at Dec. 31, 2018 | $ 5,129 |  | $ 15 |  | 148,641 |  | (143,527)
Balance, shares at Dec. 31, 2018 |  |  | 15,591,357 |  |  |  |
Issuance of common stock, net of issuance costs |  |  | $ 1 | $ 4 | 1,603 | $ 36,845 |
Issuance of common stock, net of issuance costs, shares |  |  | 227,628 | 4,297,901 |  |  |
Taxes paid on net issuance of restricted stock award |  |  |  |  | (1,897) |  |
Exercise of stock options |  |  |  |  | 55 |  |
Exercise of stock options, shares | 72,034 |  | 72,034 |  |  |  |
Exercise of warrants |  |  |  |  | 23 |  |
Exercise of warrants, shares |  |  | 155,338 |  |  |  |
Employee and nonemployee stock-based compensation |  |  |  |  | 5,604 |  |
Net loss | $ (12,289) |  |  |  |  |  | (12,289)
Balance, at end of period at Jun. 30, 2019 | 35,078 |  | $ 20 |  | 190,874 |  | (155,816)
Balance, shares at Jun. 30, 2019 |  |  | 20,344,258 |  |  |  |
Balance, beginning of period at Mar. 31, 2019 |  |  | $ 16 |  | 150,332 |  | (149,733)
Balance, shares at Mar. 31, 2019 |  |  | 15,873,705 |  |  |  |
Issuance of common stock, net of issuance costs |  |  |  | $ 4 |  | $ 36,845 |
Issuance of common stock, net of issuance costs, shares |  |  |  | 4,077,143 |  |  |
Net issuance of restricted stock award, shares |  |  | 220,758 |  |  |  |
Taxes paid on net issuance of restricted stock award |  |  |  |  | (1,897) |  |
Exercise of stock options |  |  |  |  | 14 |  |
Exercise of stock options, shares |  |  | 17,314 |  |  |  |
Exercise of warrants |  |  |  |  | 23 |  |
Exercise of warrants, shares |  |  | 155,338 |  |  |  |
Employee and nonemployee stock-based compensation |  |  |  |  | 5,557 |  |
Net loss | (6,083) |  |  |  |  |  | (6,083)
Balance, at end of period at Jun. 30, 2019 | $ 35,078 |  | $ 20 |  | $ 190,874 |  | $ (155,816)
Balance, shares at Jun. 30, 2019 |  |  | 20,344,258 |  |  |  |

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