Deerfield Loan (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Installment	Jun. 30, 2013	Jun. 30, 2014 Installment	Jun. 30, 2013	Dec. 31, 2013
Line of Credit Facility [Line Items]
Loan facility, maximum amount	$ 30,000,000		$ 30,000,000
Number of loan installments	3		3
Loan facility payment terms			The principal amount of the loan is payable in equal annual installments on the fourth, fifth and sixth anniversaries of the Deerfield Loan agreement, provided that the amount payable on the fourth anniversary shall be deferred for one year if either (i) our “Net Sales” for the immediately preceding 12-month period are at least $20 million, or (ii) our “Equity Value” is at least $200 million; and provided further, that the amount payable on the fifth anniversary (together with any amount deferred on the fourth anniversary) shall be deferred until the sixth anniversary if either (i) our “Net Sales” for the immediately preceding 12-month period are at least $30 million, or (ii) our “Equity Value” is at least $250 million.
Cash interest rate under loan facility (in hundredths)	8.75%		8.75%
Carrying value of Facility Agreement [Abstract]
Note Payable	30,000,000		30,000,000		30,000,000
Unamortized discount	(10,736,000)		(10,736,000)		(11,646,000)
Long-term debt, net of discount	19,264,000		19,264,000		18,354,000
Interest expense [Abstract]
Cash interest expense	654,000	218,000	1,302,000	331,000
Non-cash amortization of debt discounts	470,000	118,000	909,000	177,000
Amortization of debt costs	5,000	5,000	10,000	8,000
Total interest expense	1,129,000	341,000	2,221,000	516,000
Fourth anniversary [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Net sales for 12-month period immediately preceding repayment date	20,000,000		20,000,000
Equity Value at repayment date	200,000,000		200,000,000
Sixth anniversary [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Net sales for 12-month period immediately preceding repayment date	30,000,000		30,000,000
Equity Value at repayment date	$ 250,000,000		$ 250,000,000
Deerfield Management Company [Member]
Line of Credit Facility [Line Items]
Number of shares under issued warrants (in shares)	7.0		7.0
Exercise price of warrants (in dollars per share)	$ 2.81		$ 2.81