Equity Investment - Additional Information (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments	$ 357	$ 186	$ 1,202	$ 563
PACT Pharma
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments	$ 400	$ 200	1,200	$ 600
Unrealized loss on equity method investments			$ 100
PACT Pharma | Series A Preferred Stock
Schedule of Equity Method Investments [Line Items]
Purchase of common stock, shares					1.0
PACT Pharma | Common Stock
Schedule of Equity Method Investments [Line Items]
Purchase of common stock, shares					3.6