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Significant Accounting Policies - Additional Information (Detail) shares in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 shares	Jun. 30, 2018 shares	Jun. 30, 2019 Segment shares	Jun. 30, 2018 shares	Dec. 31, 2017
Accounting Policies [Abstract]
Number of operating segment | Segment			1
Short term investments maturity			12 months
Anti-dilutive shares | shares	4.4	8.8	3.4	8.7
U.S. federal statutory income tax rate			21.00%		35.00%

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Short term investments maximum maturity period.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Name Accounting Standards Codification
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-SubTopic 10
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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