Fair Value Measurement - Summary of Changes in Fair Value of Warrants for Preferred Shares (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($)
Fair Value Disclosures [Abstract]
Balance at the beginning of the period	$ 3,612
Changes in fair value during the period	(109)
Balance at end of the period	$ 3,503

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration