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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Series A Redeemable Convertible Preferred Stock | Series B Redeemable Convertible Preferred Stock | Common Stock | Additional Pain In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ (31,929) |  |  | $ 1 | $ 1,849 | $ (33,779) |
Balance, shares at Dec. 31, 2017 |  |  |  | 4,562,640 |  |  |
Balance, temporary equity, shares at Dec. 31, 2017 |  | 15,527,951 | 4,792,716 |  |  |  |
Balance, temporary equity at Dec. 31, 2017 |  | $ 41,674 | $ 39,946 |  |  |  |
Conversion of convertible preferred stock into common stock upon the closing of initial public offering, Shares |  | (15,527,951) | (4,792,716) | 15,870,559 |  |  |
Conversion of convertible preferred stock into common stock upon the closing of initial public offering | 81,620 | $ (41,674) | $ (39,946) | $ 1 | 81,619 |  |
Issuance of common stock | 89,370 |  |  | $ 1 | 89,369 |  |
Issuance of common stock, Shares |  |  |  | 6,516,667 |  |  |
Vesting of restricted shares, value | 865 |  |  |  | 865 |  |
Vesting of restricted shares |  |  |  | 1,096,449 |  |  |
Stock-based compensation expense | 316 |  |  |  | 316 |  |
Net loss | (9,859) |  |  |  |  | (9,859) |
Balance at Mar. 31, 2018 | 130,383 |  |  | $ 3 | 174,018 | (43,638) |
Balance, shares at Mar. 31, 2018 |  |  |  | 28,046,315 |  |  |
Balance, temporary equity, shares at Mar. 31, 2018 |  | 0 | 0 |  |  |  |
Balance, temporary equity at Mar. 31, 2018 |  | $ 0 | $ 0 |  |  |  |
Balance at Dec. 31, 2018 | $ 104,204 |  |  | $ 3 | 175,635 | (71,393) | $ (41)
Balance, shares at Dec. 31, 2018 | 28,054,344 |  |  | 28,054,344 |  |  |
Issuance of common stock | $ 46,585 |  |  | $ 1 | 46,584 |  |
Issuance of common stock, Shares |  |  |  | 7,200,000 |  |  |
Vesting of restricted shares, value | 1 |  |  |  | 1 |  |
Vesting of restricted shares |  |  |  | 500 |  |  |
Stock-based compensation expense | 662 |  |  |  | 662 |  |
Net loss | (11,069) |  |  |  |  | (11,069) |
Unrealized gain (losses) on marketable securities | 73 |  |  |  |  |  | 73
Balance at Mar. 31, 2019 | $ 140,456 |  |  | $ 4 | $ 222,882 | $ (82,462) | $ 32
Balance, shares at Mar. 31, 2019 | 35,254,844 |  |  | 35,254,844 |  |  |

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