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Summary Of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |  |
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Dec. 31, 2017 USD ($) customer $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 01, 2017 USD ($) | Oct. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cost to cost of service and other revenue related to change in estimated useful life of lease instruments | $ 1,600,000 |  |  |  |
Cost to cost of service and other revenue related to change in estimated useful life of lease instruments, impact on earnings per share | $ / shares | $ (0.01) |  |  |  |
Fair value assets liabilities transfer between levels | $ 0 |  |  |  |
Future cash flows weighted average market yield | 10.30% | 10.60% |  |  |
Investments impariment charges | $ 0 | $ 0 | $ 0 |  |
Long-term restricted cash | 4,500,000 | 4,500,000 |  |  | $ 4,500,000
Long-lived assets impairment charges | 0 |  |  |  |
Deferred tax assets | 251,425,000 | 317,484,000 |  | $ 321,500,000 |
Cash, cash equivalents and investments | $ 62,900,000 | $ 72,000,000 |  |  |
Sales Revenue, Net [Member] | Gene Company Limited [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage | 31.00% |  |  |  |
Number of individual customers | customer | 1 |  |  |  |
Accounts Receivable [Member] | Domestic Customers [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage | 84.00% | 84.00% |  |  |
Accounts Receivable [Member] | Gene Company Limited [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage | 20.00% |  |  |  |
Number of individual customers | customer | 1 |  |  |  |
Building [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 30 years |  |  |  |
Minimum [Member] | Computer Equipment [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 2 years |  |  |  |
Minimum [Member] | Software [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 3 years |  |  |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 3 years |  |  |  |
Minimum [Member] | Lab Equipment [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 3 years |  |  |  |
Maximum [Member] | Computer Equipment [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 3 years |  |  |  |
Maximum [Member] | Software [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 5 years |  |  |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 7 years |  |  |  |
Maximum [Member] | Lab Equipment [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life | 5 years |  |  |  |
Federal [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Excluded windfall tax deductions |  | $ 6,000,000 |  |  |
State [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Excluded windfall tax deductions |  | $ 600,000 |  |  |

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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