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The Company and Summary of Significant Accounting Policies (Details Textual) |  |  | 1 Months Ended | 12 Months Ended
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Oct. 09, 2018 $ / shares | Apr. 11, 2018 $ / shares | Feb. 22, 2019 USD ($) | Dec. 31, 2018 USD ($) Patients Segment | Dec. 31, 2017 USD ($)
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |  |  |
Revenues |  |  |  | $ 0 |
Concentrations of credit risk |  |  |  | $ 0 |
Number of segments | Segment |  |  |  | 1 |
Nasdaq Capital Market |  |  |  |  |
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |  |  |
Common stock not met minimum closing bid price, preceding days |  | 30 days |  |  |
Minimum consecutive business days | 10 days |  |  |  |
Additional granted days for common stock to meet minimum bid price | 180 days |  |  |  |
Common stock bid price, description |  |  |  | On April 11, 2018, the Company received notification from Nasdaq of potential delisting of its shares from the Nasdaq Capital Market because the closing bid price of its common stock had not met the minimum closing bid price of $1.00 per share during the preceding 30 days. On October 9, 2018, ARCA received a written notification from NASDAQ granting an additional 180 calendar day period, until April 8, 2019, to regain compliance with the minimum bid price requirement. The minimum bid price requirement will be met if the Common Stock has a closing bid of at least $1.00 per share for a minimum of 10 consecutive business days during the 180 day period. |
Nasdaq Capital Market | Minimum |  |  |  |  |
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |  |  |
Minimum closing bid price | $ / shares | $ 1.00 | $ 1.00 |  |  |
Sales Agreement |  |  |  |  |
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  | $ 3,400,000 | $ 6,100,000
Subsequent Event | Sales Agreement |  |  |  |  |
Company And Summary Of Significant Accounting Policies Table [Line Items] |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 2,400,000 |  |
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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