Organization and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Lease assets	$ 681,000
Operating lease, liability	699,000
Operating lease, liability, noncurrent	82,000
Retained Earnings | ASU 2016-02
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Cumulative effect adjustment to retained earnings	$ 0
California
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Company original incorporation date of incorporation	2012-04
Company Incorporation place	California
Delaware
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Company Incorporation place	Delaware
Company reincorporation incorporation date of incorporation	2017-07