For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Organization and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		3 Months Ended
	Jan. 01, 2019 segment	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Accounting Principle [Line Items]
Number of Reportable Segments \| segment	1
Number of Operating Segments \| segment		1
Total revenues		$ 202,517	$ 182,619
Product revenues
Accounting Principle [Line Items]
Total revenues		145,610	$ 130,659
Difference between Revenue Guidance in Effect before and after Topic 606 \| Product revenues
Accounting Principle [Line Items]
Total revenues		$ 600
Lease Receivable \| Customer Concentration Risk
Accounting Principle [Line Items]
Concentration risk percentage		44.00%