Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

The following table summarizes the changes in the allowance for doubtful accounts receivable for the indicated periods:

	Balance at beginning of year	Additions charged to earnings		Uncollectible receivables written off, net of recoveries		Balance at end of year
December 31, 2014	5	12		(2	)	17
December 31, 2013	25	(20	)	—		5
December 31, 2012	—	25		—		25

Schedule of computation of basic and diluted earnings per share

Basic loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during a period.  The diluted loss per share calculation gives effect to dilutive options, warrants, convertible notes, convertible preferred stock, and other potential dilutive common stock including selected restricted shares of common stock outstanding during the period.  Diluted loss per share is based on the treasury stock method and includes the effect from potential issuance of common stock, such as shares issuable pursuant to the exercise of stock options and warrants, assuming the exercise of all in-the-money stock options and warrants.  Common share equivalents have been excluded where their inclusion would be anti-dilutive. 

	For the Twelve Months Ended December 31,
($ in thousands except share and per share data)	2014			2013			2012
Loss per share — Basic:
Numerator for basic loss per share	$	(25,650	)	$	(31,554	)	$	(12,711	)
Denominator for basic loss per share	40,789,445			29,830,207			8,965,098
Basic loss per common share	$	(0.63	)	$	(1.06	)	$	(1.42	)
Loss per share — Diluted:
Numerator for basic loss per share	$	(25,650	)	$	(31,554	)	$	(12,711	)
Adjust: Fair value of dilutive warrants outstanding	2,840			2,270			11,091
Numerator for diluted loss per share	$	(28,490	)	$	(33,824	)	$	(23,802	)
Denominator for basic loss per share	40,789,445			29,830,207			8,965,098
Plus: Incremental shares underlying “in the money” warrants outstanding	179,954			366,409			181,962
Denominator for diluted loss per share	40,969,399			30,196,616			9,147,060
Diluted loss per common share	$	(0.70	)	$	(1.12	)	$	(2.60	)

Securities Excluded from Calculation of Weighted-Average Shares Outstanding

The following potentially dilutive securities have been excluded from the computations of diluted weighted-average shares outstanding, as their effect would be anti-dilutive:

	For the Twelve Months Ended December 31,
	2014	2013	2012
Shares underlying “out of the money” options outstanding	2,086,450	1,070,720	562,025
Shares underlying “in the money” options outstanding	—	998,000	—
Shares underlying “out of the money” warrants outstanding	4,831,352	4,831,352	4,845,352
Shares underlying “in the money” warrants outstanding	—	—	1,320