Restructuring Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		10 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014 position	Jan. 31, 2013 employee
Par Sterile [Member]
Restructuring Reserve [Roll Forward]
Initial Charge	$ 1,146
Additional Charge	3,527
Cash Payments	(2,686)
Non-Cash Charge Related to Inventory and/or Intangible Assets	0
Reversals, Reclass or Transfers	0
Liabilities, ending balance	1,987		1,987
Irvine Restructuring [Member]
Restructuring Reserve [Roll Forward]
Initial Charge	740
Additional Charge	0
Cash Payments	(127)
Non-Cash Charge Related to Inventory and/or Intangible Assets	0
Reversals, Reclass or Transfers	0
Liabilities, ending balance	613		613
Par Specialty [Member]
Restructuring Reserve [Roll Forward]
Initial Charge		1,816		1,816
Cash Payments		(1,409)
Non-Cash Charge Related to Inventory and/or Intangible Assets		(403)
Reversals, Reclass or Transfers		(4)
Liabilities, ending balance		0
Employee Severance [Member] | Par Sterile [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, number of employees			25
Employee Severance [Member] | Irvine Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, number of employees	44
Employee Severance [Member] | Par Specialty [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, number of employees				70
Number of positions remaining				60
Intangible Asset Impairment [Member] | Par Specialty [Member]
Restructuring Reserve [Roll Forward]
Initial Charge		403		403
Cash Payments		0
Non-Cash Charge Related to Inventory and/or Intangible Assets		(403)
Reversals, Reclass or Transfers		0
Liabilities, ending balance		0
Employee Severance and Termination Benefits [Member] | Par Sterile [Member]
Restructuring Reserve [Roll Forward]
Initial Charge	1,146
Additional Charge	3,527
Cash Payments	(2,686)
Non-Cash Charge Related to Inventory and/or Intangible Assets	0
Reversals, Reclass or Transfers	0
Liabilities, ending balance	1,987		1,987
Employee Severance and Termination Benefits [Member] | Irvine Restructuring [Member]
Restructuring Reserve [Roll Forward]
Initial Charge	740
Additional Charge	0
Cash Payments	(127)
Non-Cash Charge Related to Inventory and/or Intangible Assets	0
Reversals, Reclass or Transfers	0
Liabilities, ending balance	613		613
Employee Severance and Termination Benefits [Member] | Par Specialty [Member]
Restructuring Reserve [Roll Forward]
Initial Charge		1,413		1,413
Cash Payments		(1,409)
Non-Cash Charge Related to Inventory and/or Intangible Assets		0
Reversals, Reclass or Transfers		(4)
Liabilities, ending balance		$ 0