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Mezzanine and Stockholders' Equity - Summary of Warrant (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Shares |  |
Warrants outstanding, beginning balance (in shares) | 3,331,995 |
Warrants granted (in shares) | 0 |
Warrants exercised (in shares) | (41,624) |
Warrants expired/forfeited (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 3,290,371 | 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) | 9.41 |
Warrants expired/forfeited (in dollars per share) | 0.00 |
Warrants outstanding, ending balance (in dollars per share) | $ 9.93 | $ 9.93
Weighted Average Remaining Contractual Term |  |
Warrants outstanding | 2 years 5 months 23 days | 2 years 11 months 19 days
Aggregate Intrinsic Value |  |
Warrants outstanding, beginning balance | $ 33.1 |
Warrants granted | 0.0 |
Warrants exercised | 0.3 |
Warrants expired/forfeited | 0.0 |
Warrants outstanding, ending balance | $ 22.3 | $ 33.1

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