Coinbase does not report your sell transactions to IRS.
(This could change in the future)
With only losses, there is no income and no requirement to file a tax return.
The carry forward of tax loss into the future using schedule D may or may not be worth the hassle of preparing the report., which has to come from your own detailed records.
This is your choice.
When not self-employed, the threshold for having to report is around $12,400 dollars of income (Standard Deduction)
