Equity Investment - Additional Information (Details) - USD ($) shares in Millions	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments			$ 412,000	$ 151,000	$ 844,000	$ 377,000
PACT Pharma
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments			400,000	$ 200,000	$ 800,000	400,000
Equity method investment agreement termination date					May 31, 2018
Gain in interest and other income							$ 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			0		0		100,000
Payable to PACT Pharma			$ 100,000		$ 100,000		$ 0
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