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


	June 30, 2026			December 31, 2025
Accounts receivable – commercial
Accounts receivable, gross	$	37,276		$	44,274
Wholesaler distribution fees and prompt pay discounts		(2,626	)		(3,332	)
Reserve for returns		(10,141	)		(10,208	)
Allowance for credit losses		—			(61	)
Total accounts receivable – commercial, net		24,509			30,673
Accounts receivable – collaborations and services		18,698			7,694
Total accounts receivable, net	$	43,207		$	38,367

As of June 30, 2026, there was no allowance for credit losses for commercial accounts receivable or credit losses for collaborations and services accounts receivable. As of June 30, 2026 and December 31, 2025, the Company's three customers representing the largest individual accounts receivable balances accounted for approximately 66% and 68% of commercial accounts receivable, respectively. As of June 30, 2026 and December 31, 2025, the Company's collaboration partner, UT, accounted for 97% and 94%, respectively, of the collaborations and services accounts receivable.

UT accounted for approximately 61% of consolidated revenues for both the three and six months ended June 30, 2026 and 70% and 72% for the three and six months ended June 30, 2025, respectively. For the three and six months ended June 30, 2026, one single commercial customer accounted for 15% and 11%, respectively, of the Company's consolidated revenues. For the three months ended June 30, 2025, two other commercial customers each accounted for approximately 12% of the Company's consolidated revenues. For the six months ended June 30, 2025, two other commercial customers accounted for approximately 12% and 11% of the Company’s consolidated revenues.