Capitalization and Equity Structure (Details) - $ / shares shares in Thousands		1 Months Ended		12 Months Ended
		Apr. 30, 2017	Dec. 31, 2015	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Schedule of Capitalization, Equity [Line Items]
Merger/PPO Warrant Shares Outstanding				3,396		3,597
Merger/PPO Warrant Shares Issued				2,066
Merger/PPO Warrant Shares Repurchased	[1]			(1,866)
Merger/PPO Warrant Shares Expired				(371)
Merger/PPO Warrant Shares Exercised				(30)
2017 Warrants [Member]
Schedule of Capitalization, Equity [Line Items]
Exercise price		$ 4.10		$ 4.1
Warrant term				5 years
Merger/PPO Warrant Shares Outstanding				0		0
Merger/PPO Warrant Shares Issued		1,866		1,866
Merger/PPO Warrant Shares Repurchased	[1]			(1,866)
Merger/PPO Warrant Shares Expired				0
Merger/PPO Warrant Shares Exercised				0
2015 Warrants [Member]
Schedule of Capitalization, Equity [Line Items]
Exercise price				$ 3.74
Warrant term				5 years
Merger/PPO Warrant Shares Outstanding				1,604		1,634
Merger/PPO Warrant Shares Issued			2,122	0
Merger/PPO Warrant Shares Repurchased	[1]			0
Merger/PPO Warrant Shares Expired				0
Merger/PPO Warrant Shares Exercised				(30)
Placement agent warrants [Member]
Schedule of Capitalization, Equity [Line Items]
Exercise price				$ 7
Warrant term				5 years
Merger/PPO Warrant Shares Outstanding				426		426
Merger/PPO Warrant Shares Issued				0
Merger/PPO Warrant Shares Repurchased	[1]			0
Merger/PPO Warrant Shares Expired				0
Merger/PPO Warrant Shares Exercised				0
Bridge warrants [Member]
Schedule of Capitalization, Equity [Line Items]
Exercise price				$ 7
Warrant term				3 years
Merger/PPO Warrant Shares Outstanding				0		371
Merger/PPO Warrant Shares Issued				0
Merger/PPO Warrant Shares Repurchased	[1]			0
Merger/PPO Warrant Shares Expired				(371)
Merger/PPO Warrant Shares Exercised				0
PPO warrants [Member]
Schedule of Capitalization, Equity [Line Items]
Exercise price				$ 14
Warrant term				5 years
Merger/PPO Warrant Shares Outstanding				1,078		1,078
Merger/PPO Warrant Shares Issued				0
Merger/PPO Warrant Shares Repurchased	[1]			0
Merger/PPO Warrant Shares Expired				0
Merger/PPO Warrant Shares Exercised				0
Pre 2014 Warrants [Member]
Schedule of Capitalization, Equity [Line Items]
Exercise price				$ 9.66
Merger/PPO Warrant Shares Outstanding				88		88
Merger/PPO Warrant Shares Issued				0
Merger/PPO Warrant Shares Repurchased	[1]			0
Merger/PPO Warrant Shares Expired				0
Merger/PPO Warrant Shares Exercised				0
Pre 2014 Warrants [Member] | Minimum [Member]
Schedule of Capitalization, Equity [Line Items]
Warrant term				9 years
Pre 2014 Warrants [Member] | Maximum [Member]
Schedule of Capitalization, Equity [Line Items]
Warrant term				10 years
Information Agent Warrants [Member]
Schedule of Capitalization, Equity [Line Items]
Exercise price				$ 1.5	$ 1.50
Warrant term				3 years
Merger/PPO Warrant Shares Outstanding				200		0
Merger/PPO Warrant Shares Issued				200
Merger/PPO Warrant Shares Repurchased	[1]			0
Merger/PPO Warrant Shares Expired				0
Merger/PPO Warrant Shares Exercised				0

[1] The April 2017 Warrants were repurchased at a price of $1.23 per underlying share, as a result of the August 2017 Rights Offering.