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Liquidity and Going Concern (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Apr. 10, 2018	Mar. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Liquidity [Abstract]
Accumulated deficit			$ (229,406)	$ (210,575)
Class of Stock [Line Items]
Revenue covenants, cure period in the event of default			30 days
Term-Note Credit Facility [Member]
Class of Stock [Line Items]
Debt balance outstanding under credit facility agreement			$ 10,240	$ 11,466
Subsequent Event [Member] \| Broadfin Capital [Member]
Class of Stock [Line Items]
Percentage of blocker prior to record date for meeting of shareholders	9.99%	9.99%
Subsequent Event [Member] \| Sabby Management [Member]
Class of Stock [Line Items]
Percentage of blocker prior to record date for meeting of shareholders	9.99%	9.99%
Subsequent Event [Member] \| Accelmed Stock Purchase Agreement [Member]
Class of Stock [Line Items]
Expected equity financing investment		$ 13,000
Expected equity financing investment (in shares)		12,037,037
Share price (in dollars per share)		$ 1.08
Subsequent Event [Member] \| Broadfin Capital and Sabby Management Stock Purchase Agreements [Member] \| Broadfin Capital [Member]
Class of Stock [Line Items]
Expected equity financing investment		$ 1,000
Expected equity financing investment (in shares)		925,926
Share price (in dollars per share)		$ 1.08
Subsequent Event [Member] \| Broadfin Capital and Sabby Management Stock Purchase Agreements [Member] \| Sabby Management [Member]
Class of Stock [Line Items]
Expected equity financing investment		$ 1,000
Expected equity financing investment (in shares)		925,926
Share price (in dollars per share)		$ 1.08
Subsequent Event [Member] \| Midcap Non-binding Letter of Intent Agreement [Member]
Class of Stock [Line Items]
Expected equity financing investment		$ 14,000
Percentage of blocker prior to record date for meeting of shareholders		19.99%
Repayment on current facility		$ 3,000
Subsequent Event [Member] \| Subscription Agreement [Member] \| Broadfin Capital [Member]
Class of Stock [Line Items]
Expected equity financing investment		$ 1,000
Expected equity financing investment (in shares)		925,926
Share price (in dollars per share)		$ 1.08
Subsequent Event [Member] \| Subscription Agreement [Member] \| Sabby Management [Member]
Class of Stock [Line Items]
Expected equity financing investment		$ 1,000
Expected equity financing investment (in shares)		925,926
Share price (in dollars per share)		$ 1.08