Other Financial Information - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Financial Information [Abstract]
Accounts payable	$ 4,152	$ 4,694
Accrued clinical expenses	235	399
Accrued research and development costs	1,696	2,644
Accrued selling, general and administrative expenses	2,057	2,767
Accrued other expense	360	682
Total accounts payable and accrued expenses	$ 8,500	$ 11,186