Haven't read the S-1, but their gross margins appear pretty solid, so they're probably spending aggressively in SG&A and capex-heavy depreciated assets that will hit COGS over time.

Eg growing from 3 stores to 22 in two years probably requires a lot of big upfront expenditures.

It's important to look at cashflow statements, P&L, and balance sheet in concert rather than isolation -- especially for larger fast-growing companies.