Deferred Contract Acquisition and Fulfillment Costs (Details) - Contract Acquisition and Fulfillment Costs [Member] - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Capitalized Contract Costs [Roll Forward]
Beginning balance	$ 51,260	$ 39,955
Capitalization of contract acquisition and fulfillment costs	5,084	4,309
Amortization of deferred contract acquisition and fulfillment costs	(4,569)	(3,216)
Ending balance	$ 51,775	$ 41,048

Amount, after 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/2003/role/disclosureRef
-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_CapitalizedContractCostNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant