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Equity-based compensation (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Payment Arrangement [Abstract]

Schedule of fair value assumptions

PICU fair values were calculated using the following assumptions:

		December 31, 2018								December 31, 2017
(Percents)		Start				End				Start				End
Risk-free interest rate			2.20	%			2.51	%			1.93	%			2.20	%
Volatility			91.00	%			80.00	%			101.03	%			91.00	%

Summary of stock option activity

Profit Interest Common Units activity summary		Number of Units				Weighted Average Grant- Date Fair Value per Unit
Nonvested units at December 31, 2017			959			$	—
Granted			332				442.30
Vested			780				169.55
Forfeited			30				442.30
Nonvested units at December 31, 2018			481			$	22.07

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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