Organization and Summary of Significant Accounting Policies - Summary of Activity Product Returns and Discounts and Rebates (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Balance at December 31, 2018	$ 81
Provision	870
Payments/credits	(201)
Balance at June 30, 2019	750
Product Returns Allowance [Member]
Balance at December 31, 2018	33
Provision	681
Payments/credits	(50)
Balance at June 30, 2019	664
Discounts and Rebates Allowance [Member]
Balance at December 31, 2018	48
Provision	189
Payments/credits	(151)
Balance at June 30, 2019	$ 86