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Significant Accounting Policies - Recently Issued Accounting Standards (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2018
ASU 2014-09 |  |
New accounting pronouncement, modified retrospective method |  |
Cumulative impact of adoption on prior financial statements |  | $ 0
ASU 2017-01 |  |
New accounting pronouncement, modified retrospective method |  |
Impact of adoption on financial statements |  | 0
ASU 2017-09 |  |
New accounting pronouncement, modified retrospective method |  |
Impact of adoption on financial statements |  | $ 0
Restatement Adjustment Forecast | ASU 2016-02 |  |
New accounting pronouncement, modified retrospective method |  |
Transition package of practical expedients | true |
Operating Lease, Right-of-Use Asset | $ 3,600,000 |
Operating Lease, Liability | $ 4,300,000 |

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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