CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT (Parenthetical) - Restricted stock awards - shares	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of shares granted to employees and directors	4,990,971	3,140,168	2,356,418
Common Stock
Number of shares granted to employees and directors	4,990,971	3,140,168	2,356,418

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant