Revenue

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

REVENUE

13. REVENUE

Generally, our products are promoted to veterinarians and dairy and beef producers by our sales team and then sold through distributors. Our primary market is North America. We do sell into select international regions and may expand this international reach in the future. There were no material changes between the allocation and timing of revenue recognition during the year ended December 31, 2018 or the three-month periods ended March 31, 2019 or 2018 (under ASC 606). We do not have any contract assets such as contracts for which we have satisfied the performance obligations but do not yet have the right to bill for or contract liabilities such as customer advances. All trade receivables on our balance sheet are from contracts with customers. We incur no material costs to obtain contracts. As of March 31, 2018, we had a backlog of orders (representing purchase orders received from customers which were not fulfilled or paid) worth approximately $1,245,000 for the First Defense^® product line. Before June 30, 2018 we cleared all of this backlog (approximately $901,000) that was related to orders for our bivalent formats of the First Defense^® product line (which have been re-branded as Dual-Force™ First Defense^®). Demand for Tri-Shield First Defense^® continues to exceed our available inventory, but we are not accepting orders in excess of available inventory, which requires a careful allocation of inventory as it becomes available to address the needs of specific customers. As of December 31, 2018 and March 31, 2019, we had received orders representing backlogs worth approximately $393,000 and $276,000, respectively. We had sufficient inventory on hand to satisfy these orders, but this product did not ship to customers until the beginning of the next quarter because of timing issues at the end of the respective periods.

The following table presents our product sales disaggregated by geographic area:

	During the Three-Month Periods Ended March 31,
	2019		2018
United States	$	3,777,746	$	2,595,616
Other		632,815		285,569
Total product sales	$	4,410,561	$	2,881,185

The following table presents our product sales disaggregated by major product category:

	During the Three-Month Periods Ended March 31,
	2019		2018
First Defense® product line	$	4,140,917	$	2,780,869
Other animal health		136,043		100,316
Other		133,601		—
Total product sales	$	4,410,561	$	2,881,185