is the Spectroscopic Terahertz Airborne Receiver for Far-InfraRed Exploration (operating at $0.5 < z < 1.5$; @uzgil_et_al2014), and the Tomographic Ionized carbon Mapping Experiment (operating at $5 < z < 9$; @crites_et_al2014). The highest redshift bins of the latter encroach upon the Epoch of Reionization (EoR), when the first galaxies systematically reionized the hydrogen content of the intergalactic medium. Extending into the EoR, intensity mapping efforts are mainly focused around the $21\,\textrm{cm}$ line. The Donald C. Backer Precision Array for Probing the Epoch of Reionzation array (PAPER; @parsons_et_al2010), the Low Frequency Array [@van_haarlem_et_al2013], the Murchison Widefield Array [@bowman_et_al2012; @tingay_et_al2013], the Giant Metrewave Radio Telescope [@paciga_et_al2013], the Long Wavelength Array (M. W. Eastwood et al., in prep.), 21 Centimeter Array [@huang_et_al2016; @zheng_et_al2016], and the Hydrogen Epoch of Reionization Array [@deboer_et_al2016] are radio interferometers that aim to use the $21\,\textrm{cm}$ line to probe the density, ionization state, and temperature of hydrogen in the range $6 < z < 13$ and beyond. The future Square Kilometre Array [@mellema_et_al2015] will provide yet more collecting area for $21\,\textrm{cm}$ intensity mapping to complement the aforementioned experiments. With such a large suite of instruments covering an expansive range in redshift, tremendous opportunities exist for understanding the formation 