Organization and Summary of Significant Accounting Policies - Summary of Required Disclosures about Geographical Concentrations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Significant Accounting Policies [Line Items]
Revenue	$ 71,524	$ 71,914	$ 229,277	$ 207,675
United States
Significant Accounting Policies [Line Items]
Revenue	9,662	11,125	28,993	41,373
Canada
Significant Accounting Policies [Line Items]
Revenue	1,062	1,131	2,950	3,344
North America
Significant Accounting Policies [Line Items]
Revenue	10,724	12,256	31,943	44,717
Latin America
Significant Accounting Policies [Line Items]
Revenue	6,273	6,841	18,829	21,713
Europe, Middle East, Africa
Significant Accounting Policies [Line Items]
Revenue	15,838	10,425	59,429	27,264
Korea
Significant Accounting Policies [Line Items]
Revenue	20,877	19,609	55,682	50,844
Other Asia Pacific
Significant Accounting Policies [Line Items]
Revenue	17,812	22,783	63,394	63,137
International
Significant Accounting Policies [Line Items]
Revenue	$ 60,800	$ 59,658	$ 197,334	$ 162,958