NOTE 9. OTHER BALANCE SHEET ITEMS

(a) Property and Equipment, Net

Property and equipment, net, consisted of the following:


	June 30, 2016			December 31, 2015
Leasehold improvements	$	26,658		$	19,074
Computer equipment and software		20,194			16,083
Build-to-suit property		18,371			18,371
Construction in progress		6,446			14,440
Furniture and fixtures		6,014			5,714
Laboratory equipment		4,472			748

		82,155			74,430
Less: Accumulated depreciation		(21,161	)		(16,288	)

Total	$	60,994		$	58,142

(b) Accounts Payable, Accrued Expenses and Other Current Liabilities

Accounts payable, accrued expenses and other current liabilities consisted of the following:


	June 30, 2016		December 31, 2015
Clinical and preclinical	$	44,749	$	48,975
Accrued professional services and other current liabilities		24,893		14,282
Payroll and payroll-related		22,980		29,215
Royalties payable		22,740		20,665
Accounts payable		19,664		22,696
Taxes payable		—		32,565
Other payable to licensor		—		17,500
Interest payable		—		305

Total	$	135,026	$	186,203

Accounts payable represents short-term liabilities for which the Company has received and processed a vendor invoice prior to the end of the reporting period. Accrued expenses and other current liabilities represent, among other things, compensation and related benefits to employees, royalties due to licensors of technologies, estimated amounts due to third-party vendors for services rendered prior to the end of the reporting period, invoices received from third-party vendors that have not yet been processed, taxes payable, interest payable and other accrued items.