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Mezzanine and Stockholders' Equity - Summary of Warrant (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Shares |  |
Warrants outstanding, beginning balance (in shares) | 3,331,995 |
Warrants granted (in shares) | 0 |
Warrants exercised (in shares) | (133,221) |
Warrants expired/forfeited (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 3,198,774 | 3,331,995
Weighted Average Exercise Price |  |
Warrants outstanding, beginning balance (in dollars per share) | $ 9.93 |
Warrants granted (in dollars per share) | 0.00 |
Warrants exercised (in dollars per share) | 9.21 |
Warrants expired/forfeited (in dollars per share) | 0.00 |
Warrants outstanding, ending balance (in dollars per share) | $ 9.96 | $ 9.93
Weighted Average Remaining Contractual Term |  |
Warrants outstanding | 2 years 3 months 4 days | 2 years 11 months 19 days
Aggregate Intrinsic Value |  |
Warrants outstanding, beginning balance | $ 33.1 |
Warrants granted | 0.0 |
Warrants exercised | 1.4 |
Warrants expired/forfeited | 0.0 |
Warrants outstanding, ending balance | $ 24.5 | $ 33.1

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