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Employee Benefit Plans (Details) - 401(K) [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |
Company's matching percentage of employees' contribution | 100.00% | 40.00% | 40.00%
Company's matching contribution of employees' salary | 3.00% | 5.00% | 5.00%
Company's total contributions | $ 1,400,000 | $ 1,400,000 | $ 750,000
Discretionary contributions | $ 0 | $ 0 | $ 0

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