Summary of Significant Accounting Policies - Deferred Commissions (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Deferred Commissions [Roll Forward]
Balance, beginning of the period	$ 369
Deferral of commissions earned	171
Recognition of commission expense	(231)
Balance, end of the period	$ 309

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

Name:	us-gaap_CapitalizedContractCostGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant