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Equity-Based Compensation - Restricted stock (Details) - Restricted common stock $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Number of unvested awards
Outstanding, beginning (in shares) | shares	664,174
Vested (in shares) | shares	(181,274)
Forfeited (in shares) | shares	(2,237)
Outstanding, end (in shares) | shares	480,663
Weighted Average Fair Value
Outstanding, beginning (in dollars per share) | $ / shares	$ 5.77
Vested (in dollars per share) | $ / shares	5.77
Forfeited (in dollars per share) | $ / shares	5.77
Outstanding, end (in dollars per share) | $ / shares	$ 5.77
Unrecognized equity based compensation expense | $	$ 2.1
Period for recognition	1 year 7 months 6 days

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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