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Summary Of Significant Accounting Policies (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Sep. 30, 2013 USD ($) | Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Jun. 30, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) customer | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) customer $ / shares | Dec. 31, 2014 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted net loss per share | $ / shares |  |  | $ (0.21) | $ (0.19) | $ (0.21) | $ (0.23) |  |  |  |  |  |  |  |  |  |  |  |
Fair value assets liabilities transfer between levels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Future cash flows weighted average market yield | 10.60% |  | 10.60% |  |  |  | 13.50% |  |  |  |  |  |  |  |  | 10.60% | 13.50% |
Highly liquid investments considered to be cash equivalents, maximum maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |
Impairment charges on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Long-term restricted cash | $ 4,500,000 |  | $ 4,500,000 |  |  |  | $ 4,500,000 |  |  |  |  |  |  |  |  | $ 4,500,000 | $ 4,500,000 |
Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individual customers | customer |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  | 4 |
Accounts Receivable [Member] | Domestic Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84.00% | 64.00% |
Lab Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Building [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |
Minimum [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Minimum [Member] | Accounts Receivable [Member] | Customer A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |
Minimum [Member] | Accounts Receivable [Member] | Customer B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |
Minimum [Member] | Accounts Receivable [Member] | Customer C [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |
Minimum [Member] | Accounts Receivable [Member] | Customer D [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
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 |  |
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 |  |
Roche Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-refundable upfront payment |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization |  |  |  | $ 3,600,000 | $ 3,600,000 | $ 3,600,000 | $ 3,600,000 | $ 3,600,000 | $ 3,600,000 | $ 3,600,000 | $ 1,700,000 | $ 1,700,000 | $ 1,700,000 | $ 1,700,000 | $ 1,700,000 |  |  |
Additional contractual revenue being recognized in the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 |
Basic and diluted net loss per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.10) |
Collaborative arrangement expiration | Feb. 10, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period until expiration upon notice given | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue, revenue recognized |  |  | $ 1,300,000 |  |  |  | $ 20,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |

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