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Share-based compensation arrangement by share-based payment award vesting number of shares issuable.

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Share based compensation expense reversal.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the equity-based award expires, in CCYY-MM-DD format.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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Stockholders' Equity - Additional Information (Detail) - USD ($)										3 Months Ended			6 Months Ended
	Jun. 15, 2018	Mar. 15, 2018	Oct. 31, 2017	Mar. 07, 2017	Mar. 31, 2016	Feb. 23, 2016	Jan. 07, 2016	Aug. 15, 2012	Aug. 13, 2009	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	May 07, 2018	Apr. 26, 2018	Apr. 25, 2018	Dec. 31, 2017	Nov. 04, 2016
Class Of Stock [Line Items]
Common stock, par value										$ 0.001			$ 0.001					$ 0.001
Common stock, shares authorized										260,000,000			260,000,000			260,000,000	150,000,000	260,000,000
Stock options granted													0
Value of common stock shares repurchased in connection with net share settlement of restricted stock grants and option exercises													$ 146,000
Mr. Haugh
Class Of Stock [Line Items]
Employment resigned date	Jun. 15, 2018
Warrant
Class Of Stock [Line Items]
Share based compensation awards granted in period													0	0
Weighted average contractual term of awards outstanding and exercisable													3 months 3 days
Stock Options
Class Of Stock [Line Items]
Compensation expense related to stock grants													$ 0	$ 0
Stock options granted													0	0
Weighted average contractual term of awards outstanding and exercisable													1 year 3 days
Restricted Stock
Class Of Stock [Line Items]
Compensation expense related to stock grants										$ 500,000	$ 3,100,000		$ 1,500,000	$ 4,800,000
Share based compensation awards granted in period													50,000
Compensation cost not yet recognized										2,800,000			$ 2,800,000
Compensation cost not yet recognized, period for recognition													2 years
Value of common stock shares repurchased in connection with net share settlement of restricted stock grants and option exercises													$ 100,000	1,100,000
Granted													$ 0.75
Share based compensation awards forfeited in period													108,683
Restricted Stock \| Maximum
Class Of Stock [Line Items]
Share based compensation awards vesting period													3 years
Value of common stock shares repurchased in connection with net share settlement of restricted stock grants and option exercises										100,000	100,000
Retention Stock
Class Of Stock [Line Items]
Compensation expense related to stock grants										200,000	100,000		$ 500,000	500,000
Share based compensation awards granted in period							7,500,000
Share based compensation awards vesting period							3 years
Compensation cost not yet recognized										$ 400,000			$ 400,000
Share based compensation awards granted in period, value							$ 1,300,000
Grant date fair value of award issued							$ 4.25
Retention Stock \| Mr. Haugh
Class Of Stock [Line Items]
Share-based compensation award, vesting shares Issuable	0
Employment Inducement Award \| Mr. Haugh
Class Of Stock [Line Items]
Grant date fair value of award issued						$ 5.75
2009 Equity Incentive Plan
Class Of Stock [Line Items]
Number of common stock shares authorized under Equity Incentive Plan									3,000,000
Plan expiration date									Aug. 13, 2019
Amended and Restated 2009 Equity Incentive Plan
Class Of Stock [Line Items]
Number of common stock shares authorized under Equity Incentive Plan								7,000,000
Plan expiration date								Aug. 15, 2022
Number of additional common stock shares approved for issuance under Incentive Plan								4,000,000
2016 Omnibus Incentive Plan
Class Of Stock [Line Items]
Number of additional common stock shares approved for issuance under Incentive Plan			1,900,000
Common stock reserved for issuance										3,200,000			3,200,000		1,900,000				2,400,000
Long-Term Incentive Compensation \| Performance Shares
Class Of Stock [Line Items]
Compensation expense related to stock grants										$ 900,000	$ 1,900,000		$ 600,000	$ 2,000,000
Compensation cost not yet recognized										$ 1,400,000			$ 1,400,000
2016 LTIP
Class Of Stock [Line Items]
Share based compensation awards granted in period												707,028
Share based compensation awards granted in period, value					$ 5,200,000							$ 5,200,000
Granted					$ 7.31
2016 LTIP \| Maximum
Class Of Stock [Line Items]
Share based compensation awards forfeited in period													100,000	100,000
2016 LTIP \| Performance Shares \| Mr. Haugh
Class Of Stock [Line Items]
Share based compensation awards, form of awards percentage												75.00%
Description of award conversion													Subject to his continued employment, one-third of Mr. Haugh’s PSUs were to be converted to time-based awards on December 31, 2016, December 31, 2017 and December 31, 2018, based on the achievement of aggregate adjusted operating income performance targets established by the Compensation Committee
2016 LTIP \| Performance Shares \| Other Than Mr Haugh
Class Of Stock [Line Items]
Share based compensation awards vesting period												3 years
Share based compensation awards, form of awards percentage												67.00%
Share based compensation award, description of vesting rights												based on the achievement of an aggregate adjusted operating income performance target established by the Compensation Committee
2016 LTIP \| Performance Shares \| Maximum
Class Of Stock [Line Items]
Weighted average contractual term of awards outstanding and exercisable													1 year
2016 LTIP \| RSUs
Class Of Stock [Line Items]
Share based compensation awards vesting period												3 years
Share based compensation award, description of vesting rights												three equal installments annually
2016 LTIP \| RSUs \| Mr. Haugh
Class Of Stock [Line Items]
Share based compensation awards, form of awards percentage												25.00%
2016 LTIP \| RSUs \| Other Than Mr Haugh
Class Of Stock [Line Items]
Share based compensation awards, form of awards percentage												33.00%
2016 LTIP \| Time Based Awards \| Mr. Haugh
Class Of Stock [Line Items]
Share based compensation award, description of vesting rights												vest and be settled on December 31, 2018
Share based compensation awards, vested	200,000
Accelerated stock compensation expense for awards	$ 300,000
2016 LTIP \| Time Based Awards \| Mr. Haugh \| December 31, 2018
Class Of Stock [Line Items]
Share based compensation expense reversal	$ 600,000
2017 LTIP
Class Of Stock [Line Items]
Share based compensation awards granted in period				871,011
Share based compensation awards granted in period, value				$ 6,600,000
Granted				$ 7.52
Share based compensation awards forfeited in period													100,000
2017 LTIP \| Maximum
Class Of Stock [Line Items]
Share based compensation awards forfeited in period														100,000
2017 LTIP \| Performance Shares
Class Of Stock [Line Items]
Weighted average contractual term of awards outstanding and exercisable													2 years
Share based compensation awards, form of awards percentage				67.00%
Share based compensation award, description of vesting rights				based on performance metrics approved by the Compensation Committee
2017 LTIP \| RSUs
Class Of Stock [Line Items]
Share based compensation awards, form of awards percentage				33.00%
Share based compensation award, description of vesting rights				one third annually
2018 LTIP
Class Of Stock [Line Items]
Share based compensation awards granted in period		2,241,828
Share based compensation awards vesting period		15 days
Share based compensation awards granted in period, value		$ 3,100,000
Granted		$ 1.38
Share based compensation award, description of vesting rights		48 equal semi-monthly installments
Share based compensation awards forfeited in period										900,000
Share based compensation cash awards, aggregate amount.		$ 3,100,000
2018 LTIP \| Performance Shares
Class Of Stock [Line Items]
Weighted average contractual term of awards outstanding and exercisable													3 years
Share based compensation awards, form of awards percentage		50.00%
2018 LTIP \| Cash Grant
Class Of Stock [Line Items]
Share based compensation awards, form of awards percentage		50.00%