Summary of Significant Accounting Policies - Schedule of Changes in Deferred Revenue (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Revenue From Contract With Customer [Abstract]
Balance, beginning of the period	$ 7,206
Deferral of revenue	19,326
Recognition of deferred revenue	(18,452)
Balance, ending of the period	$ 8,080

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045

Name:	us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration