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Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |  |
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Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) customer $ / shares | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($) | Oct. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Charge to cost of service and other revenue related to change in estimated useful life of lease instruments |  | $ 1,600,000 |  |  |
Charge 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 | 9.60% | 10.30% |  |  |
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 service revenue | 7,400,000 |  |  |  |
Deferred service revenue, current | 6,537,000 | 6,319,000 |  |  |
Deferred service revenue, non-current | $ 890,000 | 1,075,000 |  |  |
Service period | 1 year |  |  |  |
Dividends paid | $ 0 |  |  |  |
Expected dividend payments | $ 0 |  |  |  |
Dividend yield | 0.00% |  |  |  |
Restricted cash | $ 4,500,000 | 4,500,000 | $ 4,500,000 |  |
Prepaid expenses and other current assets | $ 2,832,000 | $ 2,249,000 |  | $ 2,438,000 |
Sales Revenue, Net [Member] | Gene Company Limited [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of individual customers | customer | 1 | 1 |  |  |
Concentration risk, percentage | 26.00% | 31.00% |  |  |
Accounts Receivable [Member] | Domestic Customers [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage | 50.00% | 84.00% |  |  |
Accounts Receivable [Member] | Gene Company Limited [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of individual customers | customer | 1 |  |  |  |
Concentration risk, percentage | 14.00% | 20.00% |  |  |
Minimum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred service revenue, performance period | 1 year |  |  |  |
Deferred service revenue, non-current, recognition period | 2 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] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred service revenue, performance period | 3 years |  |  |  |
Deferred service revenue, non-current, recognition period | 5 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 |  |  |  |
Deferred Commission [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Prepaid expenses and other current assets | $ 200,000 |  |  |  |

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