XML 66 R28.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

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 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration