XML 33 R23.htm IDEA: XBRL DOCUMENT v3.10.0.1
The Company and Summary of Significant Accounting Policies (Details Textual)
 9 Months Ended
Oct. 09, 2018
$ / shares
Apr. 11, 2018
$ / shares
Sep. 30, 2018
USD ($)
Patients
Company And Summary Of Significant Accounting Policies Table [Line Items]      
Revenues | $     $ 0
Concentrations of credit risk | $     $ 0
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  
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  
Nasdaq Capital Market | Subsequent Event      
Company And Summary Of Significant Accounting Policies Table [Line Items]      
Minimum consecutive business days 10 days    
Additional granted days for common stock to meet minimum bid price 180 days    
Nasdaq Capital Market | Subsequent Event | Minimum      
Company And Summary Of Significant Accounting Policies Table [Line Items]      
Minimum closing bid price | $ / shares $ 1.00    
Phase 2B | GENETIC-AF Trial      
Company And Summary Of Significant Accounting Policies Table [Line Items]      
Number of patients enrolled | Patients     267