Organization and Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands				1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 05, 2015 USD ($) $ / shares shares	Jul. 01, 2015 shares	Apr. 24, 2015 USD ($) employee	Aug. 31, 2015 USD ($) shares	Apr. 30, 2015 employee	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Aug. 10, 2015 $ / shares	Dec. 31, 2014 shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net product revenue						$ 0	$ 0	$ 0	$ 9,840
Number of positions committed to be eliminated | employee					16
Common stock conversion ratio		0.125
Common stock shares authorized | shares		50,000,000				50,000,000		50,000,000			50,000,000
Price per share (in usd per share) | $ / shares	$ 18.00									$ 18.00
Proceeds from sale of business								$ 80,926	$ 89,624
Number of employees transitioned to Pernix | employee			100		100
Public Offering
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of shares issued in public offering | shares	5,462,500			5,462,500
Proceeds from issuance of public offering	$ 92,000			$ 92,000
Over-Allotment Option
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of shares issued in public offering | shares	712,500			712,500
Zohydro ER
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restricted cash			$ 10,000
Cash proceeds, net			80,000
Proceeds from sale of business			$ 80,000
Potential indemnification period			12 months
Zohydro ER | Ferrimill Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net product revenue			$ 926