Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($)	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Statement Of Stockholders Equity [Abstract]
Payments of stock issuance cost	$ 3,502,543	$ 3,084,385

The cash outflow for cost incurred directly with the issuance of an equity security.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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