Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
Lessee Disclosure [Abstract]
Operating lease, description		The Company leases its principal executive offices in Newark, California, under a non-cancelable operating lease which expires in October 2021.
Operating lease, expiraton period		2021-10
Operating lease right-of-use asset	$ 627	$ 627	$ 900
Operating lease liability	677	677	$ 900
Operating lease, discount rate			6.00%
Operating lease cost recognized	100	300
Rent expense	$ 100	$ 300