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Effective Tax Rate Reconciliation (Details) | 12 Months Ended
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Jun. 30, 2019 Rate | Dec. 31, 2018 Rate | Jun. 30, 2018 Rate | Dec. 31, 2017 Rate | Jun. 30, 2017 Rate
Income Tax Disclosure [Abstract] |  |  |  |  |
Computed expected tax expense | 21.00% | 21.00% | 28.10% | 35.00% | 35.00%
State income taxes, net of federal income tax benefits | 3.70% |  | 2.90% |  | 2.60%
Research and development credit | (2.50%) |  | (2.00%) |  | (2.10%)
Domestic production activities deduction | (0.00%) |  | (1.40%) |  | (2.30%)
TCJA deferred tax rate re-measurement | (0.00%) |  | (30.00%) |  | (0.00%)
Tax effects of share-based payments | (1.40%) |  | (0.80%) |  | (0.80%)
Other (net) | 0.90% |  | 0.70% |  | 0.30%
Effective Income Tax Rate | 21.70% |  | (2.50%) |  | 32.70%

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