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Preferred Redeemable Convertible Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Preferred Redeemable Convertible Stock | The following table provides a rollforward of the preferred redeemable convertible stock during the year ended December 31, 2016:
|  | Preferred |
|  | redeemable convertible stock |
|  | Shares |  |  | Amount |
Balance at December 31, 2015 |  |  | 23,271,702 |  |  | $ | 43,106,906 |
Effect of accretion to redemption value |  |  | — |  |  |  | 1,356,707 |
Conversion of preferred redeemable convertible stock into common stock |  |  | (23,271,702 | ) |  |  | (44,463,613 | )
Balance at December 31, 2016 |  |  | — |  |  | $ | — |

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- Definition Schedule of redeemable convertible preferred stock. + References No definition available. + Details
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