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Commitments And Contingencies (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 02, 2014 | Sep. 28, 2010 | Jan. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other Commitments [Line Items] |  |  |  |  |  |  |
Deferred rent obligations |  |  |  |  | $ 2,355,000 | $ 1,735,000 |
Lease expiration |  |  |  |  | Dec. 31, 2022 |  |
Total rental expense for operating leases |  |  |  |  | $ 4,300,000 | 3,400,000 | $ 3,000,000
Unreported loss liability |  |  |  |  | 1,500,000 | 1,400,000 |
Recoverable insurance amounts |  |  |  |  | 626,000 | 600,000 |
Property and equipment, net |  |  |  |  | 18,502,000 | $ 11,484,000 |
PerClot [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Prepaid royalties |  |  |  |  | 1,500,000 |  |
Net intangible assets |  |  |  |  | 2,900,000 |  |
Property and equipment, net |  |  |  |  | $ 1,200,000 |  |
Performance Stock Awards (PSAs) [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Authorized awards from approved stock incentive plans |  |  |  |  |  |  | 250,000
Stock Options [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Grants of stock options |  |  |  |  | 387,000 | 328,000 | 562,000
CEO [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Term of employment agreement |  |  |  |  | 3 years |  |
One-time signing bonus | $ 200,000 |  |  |  |  |  |
CEO [Member] | Performance Stock Awards (PSAs) [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Authorized awards from approved stock incentive plans | 250,000 |  |  |  |  |  |
CEO [Member] | Stock Options [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Grants of stock options | 400,000 |  |  |  |  |  |
Chair Of Board Of Directors [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Severance payment |  |  |  | $ 1,400,000 |  |  |
Remaining severance obligations |  |  |  |  | $ 83,000 | $ 93,000 |
Maximum [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Estimated loss |  |  |  |  | 2,800,000 |  |
Starch Technology Purchase [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Term of distribution agreement |  | 15 years |  |  |  |  |
Amount paid related to achievement of contingent milestone |  |  | $ 500,000 |  |  |  |
Expected future contingent payment amounts to be initially recorded as research and development expense |  |  |  |  | $ 1,000,000 |  |

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