Nature of the Business and Liquidity (Details Textual)		3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 13, 2018 USD ($)	Sep. 30, 2018 USD ($) segment product	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Nov. 12, 2018 USD ($)	Dec. 31, 2017 USD ($)
Summary of Significant Accounting Policies Details [Line Items]
Segments | segment		1		1
Cash and cash equivalents		$ 15,267,000		$ 15,267,000				$ 26,692,000
Investments				18,300,000
Accumulated deficit		(81,960,000)		(81,960,000)				$ (60,094,000)
Net loss		(3,945,000)	$ (8,982,000)	(21,866,000)	$ (9,070,000)
Net cash used in operating activities				(15,314,000)	(2,660,000)
Reclassification of debt, net carrying value		24,200,000		24,200,000
Partial extinguishment of Convertible 3.75% Senior Notes		$ 0	$ 0	$ 2,467,000	$ 0
United States
Summary of Significant Accounting Policies Details [Line Items]
Generic products marketed | product		32
Branded generic products marketed | product		4
Minimum | Canada
Summary of Significant Accounting Policies Details [Line Items]
Generic and branded products marketed | product		30
Subsequent Event
Summary of Significant Accounting Policies Details [Line Items]
Shelf offering, suspended	$ 50,000,000.0
Ares Capital Management | Subsequent Event | Ares Credit Facility
Summary of Significant Accounting Policies Details [Line Items]
Letter of commitment letter outstanding							$ 120,000,000.0
Ares Capital Management | Subsequent Event | 2022 Revolver
Summary of Significant Accounting Policies Details [Line Items]
Letter of commitment letter outstanding							25,000,000.0
Ares Capital Management | Subsequent Event | 2023 Term Loan
Summary of Significant Accounting Policies Details [Line Items]
Letter of commitment letter outstanding							80,000,000.0
Ares Capital Management | Subsequent Event | 2023 Delayed Draw Term Loan
Summary of Significant Accounting Policies Details [Line Items]
Letter of commitment letter outstanding							$ 15,000,000.0
London Interbank Offered Rate (LIBOR) | 2022 Revolver
Summary of Significant Accounting Policies Details [Line Items]
Stated interest rate		3.75%		3.75%
London Interbank Offered Rate (LIBOR) | 2023 Term Loan
Summary of Significant Accounting Policies Details [Line Items]
Stated interest rate		8.75%		8.75%
London Interbank Offered Rate (LIBOR) | 2023 Delayed Draw Term Loan
Summary of Significant Accounting Policies Details [Line Items]
Stated interest rate		8.75%		8.75%
Forecast | 2021 Term Loan
Summary of Significant Accounting Policies Details [Line Items]
Repayments of debt						$ 25,000,000.0
Forecast | December 2019 Note
Summary of Significant Accounting Policies Details [Line Items]
Partial extinguishment of Convertible 3.75% Senior Notes						$ 68,700,000