Equity Investment - Additional Information (Details) - USD ($) shares in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments			$ 886,000	$ 416,000	$ 0
Gain on deemed sale from equity method investee			1,229,000	0	$ 0
PACT Pharma
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments			$ 900,000	400,000
Equity method investment agreement termination date			May 31, 2018
Gain on deemed sale from equity method investee			$ 1,200,000
Equity method investments impairment			0	0
PACT Pharma | Variable Interest Entity
Schedule of Equity Method Investments [Line Items]
Receivable from PACT Pharma			$ 100,000	$ 25,000
PACT Pharma | Series A Preferred Stock
Schedule of Equity Method Investments [Line Items]
Purchase of common stock, shares	1.0
Purchase of common stock, value	$ 1,000,000
PACT Pharma | Common Stock
Schedule of Equity Method Investments [Line Items]
Purchase of common stock, shares		3.6