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Summary of Significant Accounting Policies (Narrative) (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2020 USD ($) | May 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Feb. 29, 2020 USD ($) | Dec. 31, 2019 USD ($) customer | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) customer $ / shares | May 01, 2019 USD ($) | Jan. 01, 2019 USD ($) | 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) |  |  |
Continuation Advances from Illumina |  |  |  |  | $ 18,000,000 | $ 18,000,000 |  |  |  |  |
Period in which company must repay continuation advances if change-of-controll transaction is entered into with third party |  |  |  |  |  | 2 years |  |  |  |  |
Equity or debt financing that must be raised in a single transaction |  |  |  |  |  | $ 100,000,000 |  |  |  |  |
Gain from Continuation Advances from Illumina |  |  |  |  | 18,000,000 | 18,000,000 |  |  |  |  |
Contingent repayment liability |  |  |  |  | $ 0 | 0 |  |  |  |  |
Fair value assets/liabilities transfer between levels |  |  |  |  |  | $ 0 |  |  |  |  |
Future cash flows weighted average market yield |  |  |  |  | 6.50% | 6.50% | 9.60% |  |  |  |
Investments impariment charges |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Long-term restricted cash |  |  |  |  | $ 4,000,000 | 4,000,000 | 4,500,000 |  | $ 4,000,000 |  | $ 4,500,000
Long-lived assets impairment charges |  |  |  |  |  | $ 0 |  |  |  |  |
Service period |  |  |  |  |  | 1 year |  |  |  |  |
Dividend yield |  |  |  |  |  | 0.00% |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  | 3,369,000 | $ 3,369,000 | $ 2,832,000 |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  | 32,827,000 | 32,827,000 |  |  |  | $ 35,500,000 |
Operating lease liability |  |  |  |  | 45,801,000 | 45,801,000 |  |  |  | 49,200,000 |
Operating lease liabilities, current |  |  |  |  | 3,837,000 | 3,837,000 |  |  |  | 3,400,000 |
Operating lease liabilities, non-current |  |  |  |  | $ 41,964,000 | $ 41,964,000 |  |  |  | $ 45,800,000 |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Continuation Advances from Illumina |  |  | $ 6,000,000 | $ 22,000,000 |  |  |  |  |  |  |
Period in which company must repay continuation advances if change-of-controll transaction is entered into with third party | 2 years |  |  |  |  |  |  |  |  |  |
Equity or debt financing that must be raised in a single transaction | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
Period in which company must raise equity or debt financing in a single transaction | 2 years |  |  |  |  |  |  |  |  |  |
Long-term restricted cash |  | $ 3,500,000 |  |  |  |  |  |  |  |  |
Decrease in Long-term restricted cash |  | $ 500,000 |  |  |  |  |  |  |  |  |
Sales Revenue, Net [Member] | Gene Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of individual customers | customer |  |  |  |  | 1 | 1 | 1 | 1 |  |  |
Concentration risk, percentage |  |  |  |  |  | 17.00% | 26.00% | 31.00% |  |  |
Accounts Receivable [Member] | Domestic Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 55.00% | 50.00% |  |  |  |
Accounts Receivable [Member] | Gene Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of individual customers | customer |  |  |  |  | 1 | 1 | 1 |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 11.00% | 14.00% |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred service revenue, performance period |  |  |  |  |  | 1 year |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  | $ 600,000 | $ 600,000 |  |  |  |  |

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