Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25383-109308

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

Property and Equipment - Perpetual Software License (Details) - Perpetual software license - USD ($) $ in Thousands	1 Months Ended
	Dec. 31, 2015	Sep. 30, 2017	Dec. 31, 2016
Recorded obligation
Remaining payment period	2 years
Accounts payable and accrued other expenses
Recorded obligation
License obligation		$ 3,319	$ 3,351
Other long-term liabilities
Recorded obligation
License obligation			$ 3,225