Operating Lease - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Leased Assets [Line Items]
Operating lease liability			$ (277)
2018 Operating Lease
Operating Leased Assets [Line Items]
Operating lease, initial term	7 years		7 years
Operating lease expiration period			2025-08
Operating lease, option to extend term			five years
Lessee,operating lease, discount rate	8.00%		8.00%
Irrevocable letter of credit	$ 500		$ 500
Rent expense	$ 300	$ 100	500	$ 200
Operating lease liability			$ 300