Net Loss Per Common Share (Details Textual) - Class A Common Stock [Member] - shares shares in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Net Loss Per Common Share (Textual)
Excluded shares of issued common stock subject to vesting	1,400	1,300
Shares of common stock issuable upon conversion of warrants	18,900	14,200
Common stock issuable upon conversion	31,400	44,100

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration