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Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Number of operating segments | Segment	1
Available-for-sale securities, other than temporary impairment losses	$ 0	$ 0
Allowance recorded	0	0
Impaired assets	0	$ 0		$ 0
Operating lease, ROU Assets	20,200,000		$ 16,400,000
Operating lease liabilities	$ 30,573,000		$ 27,700,000

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Amount of allowance for credit loss on accounts receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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The carrying amount on the books of the entity of the impaired asset to be disposed of by a method other than sale.

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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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Present value of lessee's discounted obligation for lease payments from operating lease.

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