Derivative Liabilities and Fair Value Measurements - Changes in Company's Derivative Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Derivative liability, beginning period	$ 3,137
Revaluation of warrants and conversion options	5,369	$ (152)
Derivative liability, ending period	6,428
Fair Value, Inputs, Level 3 [Member]
Derivative liability, beginning period	3,137
Increase due to the recording of new B3D Note based upon the Sixth Credit Agreement Amendment	1,643
Conversion of B3D Note	(599)
Settlement of derivative liability due to the exercise of Class A Warrants	(3,122)
Revaluation of warrants and conversion options	5,369
Derivative liability, ending period	$ 6,428

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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