Summary of Significant Accounting Policies - Revenue Recognition Narrative (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2013
Revenue from External Customer [Line Items]
Increase in product returns estimate	$ 2,408	$ 1,226
Change in estimate, effect on earnings per share			$ 0.03
Sales revenue, discount rate			2.00%
Sumavel DosePro [Member]
Revenue from External Customer [Line Items]
Product shelf life			30 months
Sumavel DosePro [Member] | Period Prior to Expiration [Member]
Revenue from External Customer [Line Items]
Period to accept returned unused product			6 months
Sumavel DosePro [Member] | Period After Expiration [Member]
Revenue from External Customer [Line Items]
Period to accept returned unused product			1 year