Using the information provided by @TomYoung (shown below), and because the payments were received in two different tax years, then you will report a sale in each tax year.
First Payment: The full cost basis of your stock will be applied against the first payment received and reported as a sale in that tax year.
Second Payment - New Tax Year: The second payment (assuming the escrow) will be reported as selling price with zero cost basis.
Alternative: You may qualify to use the installment sale method. See IRS Publication 537 (page 6)
First, when there's an actual "escrow" amount involved in a stock sale the IRS's guidance is that you include that escrowed amount as part of your proceeds in the year of the sale. Although the 1099-B made some distinction between "initial proceeds" and "escrowed proceeds", you don't really have two separate transactions, you have one sale with a small amount of time between the receipt of the money.
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