Commitments and Contingencies - Lease Agreements (Details) - USD ($) $ in Thousands	Jul. 15, 2018	Jan. 01, 2017
Commitments and Contingencies
Annual rent	$ 420
Operating lease - 12-month period ending July 31, 2017
Commitments and Contingencies
Annual rent		$ 289
Operating lease - 12-month period ending July 31, 2018
Commitments and Contingencies
Annual rent		297
Operating lease - 12-month period ending April 30, 2019
Commitments and Contingencies
Annual rent		305
Operating lease - 12-month period ending April 30, 2020
Commitments and Contingencies
Annual rent		422
Operating lease - 12-month period ending April 30, 2021
Commitments and Contingencies
Annual rent		429
Operating lease - 12-month period ending April 30, 2022
Commitments and Contingencies
Annual rent		$ 437