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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 06, 2017 | Dec. 31, 2015 | Dec. 31, 2016 | Sep. 09, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
General and administrative |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Compensation expense recorded |  |  | $ 21,500 |  | $ 15,300 | $ 36,800 |
Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Grant date weighted average price (in dollars per share) |  |  | $ 9.22 |  | $ 8.34 | $ 8.84 | $ 9.22
Weighted average grant date fair value of grants |  |  | $ 6.07 |  | $ 2.92 | $ 4.36 |
Number of Shares |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  | 6,735,903 | 5,319,400 |
Granted (in shares) |  |  | 5,319,400 |  | 1,206,800 | 1,790,605 |
Exercised (in shares) |  |  |  |  | (41,667) | 0 | 0
Forfeited (in shares) |  |  |  |  | (432,110) | (374,102) |
Outstanding at the end of the period (in shares) |  |  | 5,319,400 |  | 7,468,926 | 6,735,903 | 5,319,400
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 9.22 |  | $ 5.65 | $ 7.72 |
Exercised (in dollars per share) |  |  |  |  | 7.75 |  |
Forfeited (in dollars per share) |  |  |  |  | $ 8.68 | $ 8.82 |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Outstanding at the beginning of the period |  |  |  |  | $ 29 | $ 631 |
Outstanding at the end of the period |  |  | $ 631 |  |  | $ 29 | $ 631
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |
Outstanding at the end of the period |  |  | 9 years 8 months 12 days |  | 8 years 1 month 6 days | 8 years 10 months 24 days |
Assumptions: |  |  |  |  |  |  |
Weighted average grant date fair value of grants |  |  | $ 6.07 |  | $ 2.92 | $ 4.36 |
Stock price volatility (as a percent) |  |  | 56.29% |  | 52.08% | 60.18% |
Risk free rate of return (as a percent) |  |  | 1.34% |  | 2.63% | 1.94% |
Expected term |  |  | 5 years |  | 6 years | 6 years |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Exercised |  |  |  |  | $ 29 |  |
Predecessor | General and administrative |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Compensation expense recorded |  |  |  | $ 4,900 |  |  |
Predecessor | Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Grant date weighted average price (in dollars per share) |  | $ 17.80 |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  | 4,860,133 |  |  | 4,860,133
Granted (in shares) |  |  |  | 0 |  |  |
Exercised (in shares) |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  | (695,302) |  |  |
Cancelled (in shares) |  |  |  | 4,164,831 |  |  |
Outstanding at the end of the period (in shares) |  | 4,860,133 |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  |
Exercised (in dollars per share) |  |  |  |  |  |  |
Forfeited (in dollars per share) |  |  |  | 21.17 |  |  |
Cancelled (in dollars per share) |  |  |  | $ 17.23 |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |
Outstanding at the end of the period |  | 8 years 4 months 24 days |  |  |  |  |
Predecessor | Restricted Stock |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Granted other than options (in shares) |  |  |  | 0 |  |  |
2006 Long-Term Incentive Plan | Predecessor | Restricted Stock |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |
Unvested outstanding shares at the beginning of the period (in shares) |  |  |  | 2,870,405 |  |  | 2,870,405
Vested (in shares) |  |  |  | (436,256) |  |  |
Accelerated vesting (in shares) |  |  |  | (1,917,072) |  |  |
Forfeited (in shares) |  |  |  | (517,077) |  |  |
Unvested outstanding shares at the end of the period (in shares) |  | 2,870,405 |  |  |  |  |
Weighted Average Grant Date fair Value Per Share |  |  |  |  |  |  |
Unvested outstanding shares at the beginning of the period (in dollars per share) |  |  |  | $ 7.55 |  |  | $ 7.55
Vested (in dollars per share) |  |  |  | 18.50 |  |  |
Accelerated vesting (in dollars per share) |  |  |  | 5.39 |  |  |
Forfeited (in dollars per share) |  |  |  | $ 6.31 |  |  |
Unvested outstanding shares at the end of the period (in dollars per share) |  | $ 7.55 |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Aggregate Intrinsic Value at the beginning of the period (in dollars) |  |  |  | $ 3,617 |  |  | $ 3,617
Aggregate Intrinsic Value at the end of period (in dollars) |  | $ 3,617 |  |  |  |  |
2016 Incentive Plan | Common Stock |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Aggregate number of shares available | 19,000,000 |  |  | 10,000,000 |  |  |
Maximum number of shares that remained reserved for issuance under the Plan |  |  |  |  | 4,900,000 | 7,700,000 |
Increase in shares available for issuance | 9,000,000 |  |  |  |  |  |
Number of calculation days for which shares will be available for issuance. | 20 days |  |  |  |  |  |
2016 Incentive Plan | Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Weighted average remaining vesting period |  |  | 1 year 8 months 12 days |  | 10 months 24 days | 1 year 2 months 12 days |
Weighted average grant date fair value of the shares granted |  |  | $ 32,300 |  | $ 3,500 | $ 7,800 |
Proceeds from stock options |  |  |  |  | 300 |  |
Restricted stock |  |  |  |  |  |  |
Unrecognized compensation expense stock option |  |  | $ 26,500 |  | $ 5,200 | $ 13,000 | 26,500
2016 Incentive Plan | Stock options | Employee |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Share Based Compensation Arrangements by Share Based Payment Award Options Annual Vesting Percentage. |  |  |  |  |  | 33.33% |
Vesting period |  |  |  |  |  | 3 years |
Expiration term |  |  |  |  |  | 10 years |
2016 Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Weighted average remaining vesting period |  |  | 10 months 24 days |  | 1 year 1 month 6 days | 1 year 4 months 24 days |
Unrecognized compensation expense other than options |  |  | $ 11,500 |  | $ 6,100 | $ 3,200 | $ 11,500
Restricted stock |  |  |  |  |  |  |
Weighted average grant date fair value of the shares granted |  |  | $ 27,300 |  | $ 12,700 | $ 14,300 |
Number of Shares |  |  |  |  |  |  |
Unvested outstanding shares at the beginning of the period (in shares) |  |  |  |  | 745,507 | 1,738,077 |
Granted (in shares) |  |  | 2,991,202 |  | 2,326,961 | 2,022,432 |
Vested (in shares) |  |  | (1,253,125) |  | (537,411) | (2,516,647) |
Forfeited (in shares) |  |  |  |  | (262,164) | (498,355) |
Unvested outstanding shares at the end of the period (in shares) |  |  | 1,738,077 |  | 2,272,893 | 745,507 | 1,738,077
Weighted Average Grant Date fair Value Per Share |  |  |  |  |  |  |
Unvested outstanding shares at the beginning of the period (in dollars per share) |  |  |  |  | $ 7.05 | $ 9.06 |
Granted (in dollars per share) |  |  | $ 9.14 |  | 5.47 | 7.07 |
Vested (in dollars per share) |  |  | 9.24 |  | 5.89 | 8.39 |
Forfeited (in dollars per share) |  |  |  |  | 6.29 | 7.41 |
Unvested outstanding shares at the end of the period (in dollars per share) |  |  | $ 9.06 |  | $ 5.80 | $ 7.05 | $ 9.06
Aggregate Intrinsic Value |  |  |  |  |  |  |
Aggregate Intrinsic Value at the beginning of the period (in dollars) |  |  |  |  | $ 5,643 | $ 16,234 |
Aggregate Intrinsic Value at the end of period (in dollars) |  |  | $ 16,234 |  | 3,864 | 5,643 | $ 16,234
Additional Disclosures |  |  |  |  |  |  |
Total fair value of shares vested |  |  | $ 11,600 |  | $ 2,000 | $ 16,100 |
2016 Incentive Plan | Restricted Stock | Employee |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Percentage of awards other than options vesting on the annual anniversary date of the grant |  |  |  |  |  | 33.33% |
Vesting period |  |  |  |  |  | 3 years |
2016 Incentive Plan | Restricted Stock | Non-employee director |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 6 months |
2016 Incentive Plan | Predecessor | Restricted Stock |  |  |  |  |  |  |
Additional Disclosures |  |  |  |  |  |  |
Total fair value of shares vested |  |  |  | $ 900 |  |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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