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The Company and Summary of Significant Accounting Policies (Details Textual) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 19, 2018 USD ($) | Dec. 31, 2017 USD ($) Patients Segment | Dec. 31, 2016 USD ($) shares
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |
Date of completion of business combination with Nuvelo |  | Jan. 27, 2009 |
Revenues |  | $ 0 |
Excess tax benefits from share-based payments |  |  | $ 0
Number of shares withhold to satisfy statutory income tax withholding obligations | shares |  |  | 0
Concentrations of credit risk |  | $ 0 |
Number of segments | Segment |  | 1 |
At the Market Offering under Sales Agreement | Subsequent Event |  |  |
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |
Net proceeds from issuance of common stock | $ 3,400,000 |  |
Phase 2B | GENETIC-AF Trial |  |  |
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |
Number of patients enrolled | Patients |  | 267 |

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