Accounts Receivable

3 Months Ended

Mar. 31, 2022

3. Accounts Receivable

Accounts receivable, net consists of the following (in thousands):

	March 31, 2022			December 31, 2021
Accounts receivable – commercial
Accounts receivable, gross	$	8,656		$	7,939
Wholesaler distribution fees and prompt pay discounts		(1,201	)		(1,696	)
Reserve for returns		(3,089	)		(2,797	)
Total accounts receivable – commercial, net		4,366			3,446
Accounts receivable – collaborations and services
Accounts receivable, gross		6,224			2,060
Allowance for doubtful accounts		(767	)		(767	)
Total accounts receivable – collaborations and services, net		5,457			1,293
Total accounts receivable, net	$	9,823		$	4,739

As of March 31, 2022 and December 31, 2021, the allowance for doubtful accounts for accounts receivable – commercial was de minimis. The Company had three wholesale distributors representing approximately 74% of commercial accounts receivable as of March 31, 2022 and approximately 69% of gross sales for the three months ended March 31, 2022.

As of March 31, 2022, the allowance for credit losses for accounts receivable – collaborations and services of $0.8 million was related to $0.8 million of accounts receivable for Vertice Pharma for the co-promotion of Thyquidity. The Company had one collaboration partner, United Therapeutics, that comprised 100% of the collaboration and services net accounts receivable as of March 31, 2022 and approximately 94% of gross revenue from collaborations and services for the three months ended March 31, 2022.