Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Rebate Reserve) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Change in Contract Liabilities
Beginning Balance	$ 127	$ 96
Provision related to current period sales	80	145
Adjustment related to prior period sales	(1)	20
Payments or credits issued to customer	(52)	(134)
Ending Balance	$ 154	$ 127

Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=118944142&loc=SL49130611-203046-203046

Name:	us-gaap_ContractWithCustomerRefundLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant