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Summary of Significant Accounting Policies - Additional Information 4 (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Operations And Summary Of Significant Accounting Policies [Line Items]
Performance multiplier, minimum	0.00%
Performance multiplier, maximum	200.00%
Warrants for Common Stock exercise price	$ 0.01
Participating securities that share in losses	0	0
Interest paid in-kind	$ 20,014	$ 18,594
Convertible Notes
Operations And Summary Of Significant Accounting Policies [Line Items]
Interest paid in-kind	$ 20,000	$ 18,600
Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding	803,955		619,867

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Operations and summary of significant accounting policies.

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Participating securities that share in losses.

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Exercise price per share or per unit of warrants or rights outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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