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Summarizes The Revenue Expected to be Recognized in Future Related to Unsatisfied Performance Obligations (Detail) - Unsatisfied Performance Obligations - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Revenue expected to be recognized in future related to unsatisfied performance obligations [Line Items]
Capital modification revenue				$ 1,910
Scenario, Forecast
Revenue expected to be recognized in future related to unsatisfied performance obligations [Line Items]
Capital modification revenue	$ 497	$ 637	$ 776

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- Definition

Carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income during the current period and current obligations not separately disclosed in the balance sheet (other liabilities, current).

+ References

No definition available.

+ 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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- Details

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- Details

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