Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Current assets:
Cash and cash equivalents	$ 214,827	$ 192,341
Short-term marketable securities	212,536	250,775
Accounts receivable, net	82,084	84,650
Inventories	89,284	90,088
Prepaid expenses and other current assets	20,958	18,009
Total current assets	619,689	635,863
Long-term marketable securities	169,668	207,795
Property and equipment, net	170,346	164,931
Goodwill	76,783	31,969
In-process research and development	42,223	14,913
Long-term deferred tax assets, net	30,875	43,336
Other assets	139,928	117,655
Total assets	1,249,512	1,216,462
Current liabilities:
Accounts payable	27,747	32,774
Accrued expenses	58,431	75,107
Deferred revenue	19,903	19,147
Other current liabilities	4,298	4,857
Total current liabilities	110,379	131,885
Contingent consideration	23,701	9,000
Long-term deferred tax liabilities	4,204	806
Other long-term liabilities	9,380	9,305
Total liabilities	147,664	150,996
Commitments and contingencies (Note 14)
Stockholders' equity:
Class B Preferred Stock, $.01 par value Authorized - 1,000,000 shares; Issued and outstanding - none
Common stock, $.01 par value Authorized - 100,000,000 shares; Issued - 47,435,945 shares at June 30, 2019 and 47,026,226 shares at March 31, 2019 Outstanding - 45,374,278 shares at June 30, 2019 and 45,122,985 shares at March 31, 2019	450	451
Additional paid in capital	749,440	739,133
Retained earnings	647,070	602,482
Treasury stock at cost - 2,653,538 shares at June 30, 2020 and 2,533,374 shares at March 31, 2020	(286,577)	(265,411)
Accumulated other comprehensive loss	(8,535)	(11,189)
Total stockholders' equity	1,101,848	1,065,466
Total liabilities and stockholders' equity	$ 1,249,512	$ 1,216,462