Restatement of Financial Statements - Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Impact of Restatement on the Condensed Consolidated Financial Statements
Maturity (in days)			91 days
Royalty Revenue	$ 776	$ 199	$ 2,007	$ 199
Total revenue	39,362	22,687	103,778	61,443
Selling, general and administrative	22,900	17,445	65,496	54,554
Costs and Expenses	34,277	23,423	90,814	71,846
Operating income (loss)	5,085	(736)	12,964	(10,403)
Interest expense - non-recourse liability related to sale of future royalties	(998)	(326)	(2,530)	(326)
Total other expense	(1,027)	(1,635)	(5,419)	(4,310)
Earnings before income taxes	4,058	(2,371)	7,545	(14,713)
Income tax expense	142		453
Net income (loss)	$ 3,916	$ (2,371)	$ 7,092	$ (14,713)
Net income per share, basic	$ 0.08	$ (0.06)	$ 0.15	$ (0.35)
Net income per share, diluted	$ 0.08	$ (0.06)	$ 0.15	$ (0.35)
Weighted average shares outstanding, diluted	51,590,797	42,900,269	51,059,466	42,035,025
As Previously Reported
Impact of Restatement on the Condensed Consolidated Financial Statements
Revenue from royalty agreement		$ 30,000		$ 30,000
Total revenue	$ 38,586	52,488	$ 101,771	91,244
Selling, general and administrative		17,343	65,637	54,452
Costs and Expenses		23,321	90,955	71,744
Operating income (loss)	4,309	29,167	10,816	19,500
Total other expense	(29)	(1,309)	(2,889)	(3,984)
Earnings before income taxes	4,280	27,858	7,927	15,516
Income tax expense	58		782
Net income (loss)	$ 4,222	$ 27,858	7,145	$ 15,516
Net income per share, basic	$ 0.09	$ 0.65		$ 0.37
Net income per share, diluted		$ 0.39		$ 0.13
Weighted average shares outstanding, diluted		50,825,633		50,378,186
Restatement Adjustments
Impact of Restatement on the Condensed Consolidated Financial Statements
Royalty Revenue	$ 776	$ 199	2,007	$ 199
Revenue from royalty agreement		(30,000)		(30,000)
Total revenue	776	(29,801)	2,007	(29,801)
Operating income (loss)	776	(29,801)	2,007	(29,801)
Interest expense - non-recourse liability related to sale of future royalties	(998)	(326)	(2,530)	(326)
Total other expense	(998)	(326)	(2,530)	(326)
Earnings before income taxes	(222)	(30,127)	(523)	(30,127)
Net income (loss)	$ (222)	$ (30,127)	(523)	$ (30,127)
Net income per share, basic	$ (0.01)	$ (0.71)		$ (0.72)
Net income per share, diluted		$ (0.45)		$ (0.48)
Weighted average shares outstanding, diluted		(7,925,364)		(8,343,161)
Other Corrections
Impact of Restatement on the Condensed Consolidated Financial Statements
Selling, general and administrative		$ 102	(141)	$ 102
Costs and Expenses		102	(141)	102
Operating income (loss)		(102)	141	(102)
Earnings before income taxes		(102)	141	(102)
Income tax expense	$ 84		(329)
Net income (loss)	$ (84)	$ (102)	$ 470	$ (102)