The Company and Summary of Significant Accounting Policies (Details Textual)		3 Months Ended
	Apr. 03, 2019	Mar. 31, 2019 USD ($) Patients	Jan. 01, 2019 USD ($)
Company And Summary Of Significant Accounting Policies Table [Line Items]
Revenues		$ 0
Concentrations of credit risk		0
Right-of-use asset		$ 44,000
ASU 2016-02
Company And Summary Of Significant Accounting Policies Table [Line Items]
Lease lability			$ 80,000
Right-of-use asset			60,000
Remaining lease payments			$ 83,000
Discount rate			7.50%
Accrued rent			$ 20,000
Common Stock | Subsequent Event
Company And Summary Of Significant Accounting Policies Table [Line Items]
Reverse stock split description	1-for-18
Reverse stock split conversion ratio1	0.056
Phase 2B | GENETIC-AF Trial
Company And Summary Of Significant Accounting Policies Table [Line Items]
Number of patients enrolled | Patients		267