Quarterly report pursuant to Section 13 or 15(d)

Notes Payable (Narrative) (Details)

Notes Payable (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended				0 Months Ended		1 Months Ended		3 Months Ended				1 Months Ended		1 Months Ended	9 Months Ended	1 Months Ended
Notes Payable (Narrative) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jul. 15, 2014 R-NAV	Jul. 15, 2014 Federal Funds Rate R-NAV	Sep. 30, 2014 Series KK warrants Oxford Finance, LLC	Mar. 31, 2014 Oxford Finance, LLC	Sep. 30, 2014 Oxford Finance, LLC	Sep. 30, 2014 Oxford Loan Agreement, Amortization Date of April 1, 2015	Sep. 30, 2014 Oxford Loan Agreement, Amortization Date of April 1, 2016	Sep. 30, 2014 Oxford Loan Agreement, Amortization Date of April 1, 2017	Sep. 30, 2014 Series KK Warrants and other fees to lenders	Mar. 31, 2014 GECC, MidCap Financial SBIC and LP (MidCap)	Sep. 30, 2014 GECC, MidCap Financial SBIC and LP (MidCap)	Mar. 31, 2014 Second Amended Platinum Note	Sep. 30, 2014 Second Amended Platinum Note	Mar. 31, 2014 Second Amended Platinum Note Base Rate	Mar. 31, 2014 Second Amended Platinum Note Oxford Loan Agreement, Interest Rate
Debt Instrument [Line Items]
Debt face amount										$ 30,000,000
Debt instrument, interest rate										8.50%
Number of shares underlying warrant issued								391,032
Exercise price of warrant issued, dollars per share								1.918
Repayment schedule, Term											48 months	36 months	24 months
Final payment multiplier; percent item type											7.95%	8.95%	9.95%
Notes payable										30,000,000								3,200,000
Debt unamortized discount, Net														3,000,000
Debt issuance cost									120,000
Unamortized debt discount	826,440		826,440		743,062					2,600,000
Balance of debt issuance cost										99,000
Payoff amount															26,700,000
Pre-payment, Fee amount																500,000
End-of-term, Fee Amount																1,000,000
Interest rate in addition to prime rate							0.31%												6.75%	0.125%
Interest rate, stated percentage																	10.00%
Effective interest rate																		10.00%
Non-cash change in fair value	8,000		5,000															104,000
Estimated fair value																		4,400,000
Unused borrowing capacity, Amount																		31,800,000
Promissory note payable						666,666
Interest expense	921,000	976,000	2,800,000	1,800,000
Interest expense recorded related to amortization	$ 201,000	$ 258,000	$ 638,000	$ 502,000