This article presents advancements in submillimeter and terahertz receivers to support the submillimeter solar observation of lunar volatiles experiment (SSOLVE) to measure water vapor in the lunar exosphere. The experiment apparatus measures the column abundance of water vapor at 556.93 GHz and hydroxyl, the water vapor's primary photolysis product at 2.509 GHz in absorption against thermal emission by the Sun. These receivers are capable of detecting water concentrations as low as 1011 molecules/cm2 of water. The front-end systems weigh approximately 1.2 Kg and require 3.4 W at a 20% duty cycle.