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Consolidated Statements of Contingently Redeemable Preferred Equity and Stockholders' Equity (Parenthetical) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / shares
Common shares, par value | $ / shares | $ 0.001
Exchanged common shares, par value | $ / shares | $ 0.0001
Class B Preferred Units |
Issuance costs | $ | $ 18
Series C Convertible Preferred Stock |
Issuance costs | $ | $ 1,567

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