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CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK, REDEEMABLE COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands | Total | Redeemable Common Stock [Member] | Convertible Preferred Shares [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ (44,545) | $ 734 |  |  | $ 1,385 |  | $ (45,930)
Convertible preferred shares, beginning balance at Dec. 31, 2017 |  |  | $ 60,903 |  |  |  |
Beginning balance, shares at Dec. 31, 2017 |  | 107,364 |  | 350,607 |  |  |
Convertible preferred shares, beginning balance, shares at Dec. 31, 2017 |  |  | 38,018,968 |  |  |  |
Repurchase of Series Seed convertible preferred stock | (22,000) |  |  |  |  |  | (22,000)
Repurchase of Series Seed convertible preferred stock, net of issuance costs of $1 |  |  | $ (517) |  |  |  |
Repurchase of Series Seed convertible preferred stock, share | $ 0 | $ 0 |  | $ 0 | 0 | $ 0 | $ 0
Repurchase of Series Seed convertible preferred stock, net of issuance costs of $1, share |  |  | (598,975) |  |  |  |
Convertible preferred shares, ending balance at Mar. 31, 2018 |  |  | $ 60,386 |  |  |  |
Convertible preferred shares, ending balance, shares at Mar. 31, 2018 |  |  | 37,419,993 |  |  |  |
Stock-based compensation expense | 128 |  |  |  | 128 |  |
Net loss | (7,367) |  |  |  |  |  |
Net loss | (7,367) |  |  |  |  |  | (7,367)
Ending balance at Mar. 31, 2018 | (51,806) | $ 734 |  |  | 1,513 |  | (53,319)
Ending balance, shares at Mar. 31, 2018 |  | 107,364 |  | 350,607 |  |  |
Beginning balance at Dec. 31, 2018 | (77,086) | $ 734 |  |  | 2,151 |  | (79,237)
Convertible preferred shares, beginning balance at Dec. 31, 2018 | $ 64,675 |  | $ 64,675 |  |  |  |
Beginning balance, shares at Dec. 31, 2018 |  | 107,364 |  | 351,652 |  |  |
Convertible preferred shares, beginning balance, shares at Dec. 31, 2018 | 40,079,567 |  | 40,079,567 |  |  |  |
Conversion of redeemable common stock into common stock | $ 734 | $ (734) |  | $ 1 | 733 |  |
Conversion of redeemable common stock into common stock, shares |  | (107,364) |  | 107,364 |  |  |
Conversion of convertible preferred shares into common stock | 64,675 |  | $ (64,675) | $ 4 | 64,671 |  |
Conversion of convertible preferred shares into common stock, shares |  |  | (40,079,567) | 3,808,430 |  |  |
Exchange of common stock in connection with Merger | 45,541 |  |  | $ 2 | 45,539 |  |
Exchange of common stock in connection with Merger, shares |  |  |  | 2,440,582 |  |  |
Fair value of replacement equity awards | 817 |  |  |  | 817 |  |
Reclassification of warrant liability to permanent equity | 5,235 |  |  |  | 5,235 |  |
Exercise of stock options | $ 113 |  |  |  | 113 |  |
Exercise of stock options, shares | 16,483 |  |  | 16,483 |  |  |
Stock-based compensation expense | $ 262 |  |  |  | 262 |  |
Net loss | (10,850) |  |  |  |  | 23 |
Net loss | (10,873) |  |  |  |  |  | (10,873)
Ending balance at Mar. 31, 2019 | $ 29,441 |  |  | $ 7 | $ 119,521 | $ 23 | $ (90,110)
Ending balance, shares at Mar. 31, 2019 |  |  |  | 6,724,511 |  |  |

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