Revenues, Recognition and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue, net	$ 18,341	$ 16,249	$ 31,463	$ 30,794
Company product sales
Disaggregation of Revenue [Line Items]
Revenue, net	17,868	14,677	30,363	27,913
Contract manufacturing sales
Disaggregation of Revenue [Line Items]
Revenue, net	388	1,450	930	2,748
Research and development services and other income
Disaggregation of Revenue [Line Items]
Revenue, net	85	122	170	133
Topical
Disaggregation of Revenue [Line Items]
Revenue, net	12,937	7,888	21,969	15,795
Injectables
Disaggregation of Revenue [Line Items]
Revenue, net	$ 4,931	$ 6,789	$ 8,394	$ 12,118

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration