Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) product	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Summary of Significant Accounting Policies Details [Line Items]
Impairment loss on IPR&D	$ 1,200,000
Loss on impairment of intangible assets	700,000								$ 1,924,000	$ 113,000	$ 16,000
Goodwill	470,000				$ 471,000				470,000	471,000	446,000
Accounts receivable net					12,742,000					12,742,000
Allowance for doubtful accounts	2,636,000				2,185,000				2,636,000	2,185,000
Allowance for doubtful accounts related to one customer	1,700,000								$ 1,700,000
Percentage of net sales for royalty									40.00%
Royalties	222,000				856,000				$ 222,000	856,000
Royalty expense									2,200,000	2,200,000	3,000,000.0
Company product sales, net	16,777,000	$ 18,294,000	$ 16,249,000	$ 14,545,000	14,767,000	$ 11,340,000	$ 16,432,000	$ 17,663,000	65,865,000	60,202,000	63,012,000
Revenue, net									158,278,000	215,883,000	217,633,000
Total assets	190,892,000				184,585,000				190,892,000	184,585,000
Foreign currency loss									3,400,000
Unrecognized tax benefits	0								0
Unrecognized tax benefits that would impact effective tax rate	0								0
Cost of revenues									$ 43,480,000	$ 32,830,000	$ 28,325,000
Net sales revenue
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									54.00%	52.00%	41.00%
Accounts receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									68.00%	63.00%
Customer one | Sales
Summary of Significant Accounting Policies Details [Line Items]
Company product sales, net									$ 21,200,000	$ 17,000,000.0	$ 12,300,000
Customer one | Accounts receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									30.00%	15.00%
Customer two | Sales
Summary of Significant Accounting Policies Details [Line Items]
Company product sales, net									$ 6,900,000	$ 7,400,000	7,200,000
Customer two | Accounts receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									19.00%	44.00%
Customer three | Sales
Summary of Significant Accounting Policies Details [Line Items]
Company product sales, net									$ 7,300,000	$ 6,900,000	$ 6,800,000
Customer three | Accounts receivable
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									19.00%	4.00%
Maximum
Summary of Significant Accounting Policies Details [Line Items]
Intangible assets useful life									15 years
Minimum
Summary of Significant Accounting Policies Details [Line Items]
Intangible assets useful life									10 years
Net Of SRA Balance
Summary of Significant Accounting Policies Details [Line Items]
Accounts receivable net	18,100,000				31,800,000				$ 18,100,000	$ 31,800,000
US
Summary of Significant Accounting Policies Details [Line Items]
Products which the company pays royalties | product									4
Products manufactured, marketed, and distributed | product									39
Wholesalers, Distributors, National Retail Chains | Maximum
Summary of Significant Accounting Policies Details [Line Items]
Terms of customer credit									90 days
Wholesalers, Distributors, National Retail Chains | Minimum
Summary of Significant Accounting Policies Details [Line Items]
Terms of customer credit									60 days
Econazole Nitrate Cream | Product Concentration Risk | Net sales revenue
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									2.00%	4.00%	8.00%
Lidocaine Ointment | Product Concentration Risk | Net sales revenue
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									7.00%	17.00%	23.00%
Zantac Injection | Product Concentration Risk | Net sales revenue
Summary of Significant Accounting Policies Details [Line Items]
Concentration risk									5.00%	10.00%	3.00%
Shipping and Handling
Summary of Significant Accounting Policies Details [Line Items]
Cost of revenues									$ 2,100,000	$ 1,200,000	$ 700,000
Domestic
Summary of Significant Accounting Policies Details [Line Items]
Revenue, net									45,600,000	47,000,000.0	52,800,000
Total assets	132,700,000				112,600,000				132,700,000	112,600,000
Foreign
Summary of Significant Accounting Policies Details [Line Items]
Revenue, net									20,200,000	13,200,000	$ 10,200,000
Total assets	58,200,000				$ 72,000,000.0				58,200,000	$ 72,000,000.0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Summary of Significant Accounting Policies Details [Line Items]
Debt instrument, fair value disclosure	67,600,000								67,600,000
Reported Value Measurement | Fair Value, Inputs, Level 2
Summary of Significant Accounting Policies Details [Line Items]
Debt instrument, fair value disclosure	$ 71,300,000								$ 71,300,000