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Consolidated Statements of Contingently Redeemable Preferred Equity and Stockholders' Equity - USD ($) $ in Thousands | Total | Common units | Common Shares $0.0001 Par | Common Shares $0.001 Par | Additional Paid-in Capital | Unrealized Gain/(Loss) on Securities | Accumulated Deficit | Contingently redeemable Series A preferred stock | Series A Convertible Preferred Stock | Series B Convertible Preferred Stock | Series C Convertible Preferred Stock | Contingently redeemable Class A preferred units | Class A preferred units | Class B preferred units
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Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |
Balance (in units) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  | 781,693 |  |
Balance (in units) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 3,922,027 | 1,029,850
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,548 | $ 13,611
Balance at Dec. 31, 2016 | $ 8,503 |  |  |  |  |  | $ (31,248) |  |  |  |  |  |  |
Sale of preferred units, net of issuance costs | 26,648 |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,648
Sale of preferred units, net of issuance costs (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,971,717
Issuance of common stock for license agreement | 1,750 | $ 1,750 |  |  |  |  |  |  |  |  |  |  |  |
Exchange of preferred and common units into preferred and common stock |  |  |  |  |  |  |  | $ 5,000 |  |  |  | $ 5,000 |  |
Exchange of preferred and common units into preferred and common stock, Units |  |  |  |  |  |  |  | 781,693 |  |  |  | 781,693 |  |
Exchange of preferred and common units into preferred and common stock, (in units) |  |  |  |  |  |  |  |  |  |  |  |  | (3,922,027) | (3,001,567)
Exchange of preferred and common units into preferred and common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ (25,548) | $ (40,259)
Exchange of preferred and common units into preferred and common stock |  |  |  |  |  |  |  |  | $ 25,548 | $ 40,259 |  |  |  |
Exchange of preferred and common units into preferred and common stock, shares |  |  | 2,020,367 |  |  |  |  |  | 3,922,027 | 3,001,567 |  |  |  |
Exchange of preferred and common units into preferred and common stock |  |  |  |  | $ 2,342 |  |  |  |  |  |  |  |  |
Sale of preferred stock, net of issuance costs | 40,433 |  |  |  |  |  |  |  |  |  | $ 40,433 |  |  |
Sale of preferred stock, net of issuance costs (in units) |  |  |  |  |  |  |  |  |  |  | 2,882,679 |  |  |
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock |  |  |  |  |  |  |  | $ (5,000) |  |  |  |  |  |
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock, Units |  |  |  |  |  |  |  | (781,693) |  |  |  |  |  |
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock |  |  |  |  |  |  |  |  | $ (25,548) | $ (40,259) | $ (40,433) |  |  |
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock |  |  |  |  |  |  |  |  | (3,922,027) | (3,001,567) | (2,882,679) |  |  |
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock | 5,000 |  |  | $ 10 | 111,230 |  |  |  |  |  |  |  |  |
Convertible preferred stock and contingently redeemable preferred stock exchanged for common stock, shares |  |  |  | 10,587,966 |  |  |  |  |  |  |  |  |  |
Common stock ($.0001 par) exchanged for common stock ($.001 par) |  |  |  | $ 3 | (3) |  |  |  |  |  |  |  |  |
Common stock ($.0001 par) exchanged for common stock ($.001 par), shares |  |  | (2,714,694) | 2,714,694 |  |  |  |  |  |  |  |  |  |
Issuance of common stock in the Merger | 40,433 |  |  | $ 3 | 40,430 |  |  |  |  |  |  |  |  |
Issuance of common stock in the Merger, shares |  |  |  | 2,979,836 |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 5 |  |  |  | 5 |  |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 386 |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock, shares |  |  | 697,292 | 2,884 |  |  |  |  |  |  |  |  |  |
Cancellation of restricted stock |  |  | (2,965) | (13,149) |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense | 2,652 |  |  |  | 2,652 |  |  |  |  |  |  |  |  |
Effect of adoption of ASU | ASU 2016-09 |  |  |  |  | 29 |  | (29) |  |  |  |  |  |  |
Unrealized gain/(loss) on securities | (9) |  |  |  |  | $ (9) |  |  |  |  |  |  |  |
Net loss | (40,377) |  |  |  |  |  | (40,377) |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 85,038 |  |  | $ 16 | 156,685 | (9) | (71,654) |  |  |  |  |  |  |
Balance (in units) at Dec. 31, 2016 |  | 1,847,615 |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 |  | $ 592 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for license agreement (in units) |  | 179,996 |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of founders' units |  | (7,244) |  |  |  |  |  |  |  |  |  |  |  |
Exchange of common units into preferred and common stock, (in units) |  | (2,020,367) |  |  |  |  |  |  |  |  |  |  |  |
Exchange of common units into preferred and common stock, value |  | $ (2,342) |  |  |  |  |  |  |  |  |  |  |  |
Balance (in Shares) at Dec. 31, 2017 | 16,272,617 |  |  | 16,272,617 |  |  |  |  |  |  |  |  |  |
Sale of common stock | $ 82,666 |  |  | $ 9 | 82,657 |  |  |  |  |  |  |  |  |
Sale of common stock, shares |  |  |  | 9,179,500 |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 244 |  |  |  | 244 |  |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 19,830 |  |  |  |  |  |  |  |  |  |
Cancellation of restricted stock |  |  |  | (70,468) |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense | 4,317 |  |  |  | 4,317 |  |  |  |  |  |  |  |  |
Effect of adoption of ASU | ASU 2014-09 (ASC 606) | 324 |  |  |  |  |  | 324 |  |  |  |  |  |  |
Unrealized gain/(loss) on securities | (56) |  |  |  |  | (56) |  |  |  |  |  |  |  |
Net loss | (48,435) |  |  |  |  |  | (48,435) |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 124,098 |  |  | $ 25 | $ 243,903 | $ (65) | $ (119,765) |  |  |  |  |  |  |
Balance (in Shares) at Dec. 31, 2018 | 25,401,479 |  |  | 25,401,479 |  |  |  |  |  |  |  |  |  |

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