Organization and Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of securities that are antidilutive	475	272
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of securities that are antidilutive	29	12
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of securities that are antidilutive	437	236
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of securities that are antidilutive	9	24