CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 94,688	$ 76,190
Short-term marketable securities	266,643	364,506
Trade receivables, net of allowances	26,508	26,198
Inventory	4,994	4,910
Prepaid expenses and other current assets	9,067	6,697
Total current assets	401,900	478,501
Strategic inventory	13,659	16,247
Operating lease right-of-use asset	1,022	2,509
Property and equipment, net of accumulated depreciation	1,226	1,675
Long-term marketable securities	133,845	36,196
Other assets	4,106	5,000
Deferred tax assets, net	29,641	31,603
Total assets	585,399	571,731
Current liabilities:
Accounts payable	6,558	10,554
Accrued clinical expenses	12,844	13,704
Accrued and other liabilities	24,309	21,186
Short-term operating lease liability	1,046	2,050
Total current liabilities	44,757	47,494
Long-term operating lease liability	0	501
Long-term accrued income taxes	413	398
Total liabilities	45,170	48,393
Commitments and contingencies
Stockholders’ equity:
Preferred stock	0	0
Common stock	126	122
Additional paid-in capital	571,377	516,140
Treasury stock	(194,304)	(75,795)
Accumulated other comprehensive income	115	415
Retained earnings	162,915	82,456
Total stockholders’ equity	540,229	523,338
Total liabilities and stockholders’ equity	$ 585,399	$ 571,731