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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) customer | Jun. 30, 2017 USD ($) customer | Jun. 30, 2018 USD ($) customer | Jun. 30, 2017 USD ($) customer | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Fair value assets liabilities transfer between levels |  |  | $ 0 |  |
Future cash flows weighted average market yield | 9.30% |  | 9.30% |  | 10.30%
Cash, cash equivalents, and investments, excluding restricted cash | $ 63,500,000 |  | $ 63,500,000 |  | $ 62,900,000
Deferred commissions | 200,000 |  | 200,000 |  |
Deferred service revenue | 7,500,000 |  | 7,500,000 |  |
Deferred service revenue, current | 6,416,000 |  | 6,416,000 |  | 6,319,000
Deferred service revenue, non-current | 1,053,000 |  | 1,053,000 |  | $ 1,075,000
Deferred contractual revenue | 4,200,000 |  | $ 4,200,000 |  |
Service period |  |  | 1 year |  |
Restricted cash | $ 4,500,000 | $ 4,500,000 | $ 4,500,000 | $ 4,500,000 |
Gene Company Limited [Member] | Sales Revenue, Net [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of individual customers | customer | 1 | 1 | 1 | 1 |
Concentration risk, percentage | 33.00% | 26.00% | 31.00% | 28.00% |
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 |  |
Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred service revenue, performance period |  |  | 3 years |  |
Deferred service revenue, non-current, recognition period |  |  | 4 years |  |

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