Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 48,231	$ 22,401
Short-term marketable securities	163,822	109,557
Accounts receivable, net	42,821	31,828
Inventories	26,740	16,774
Prepaid expenses and other current assets	6,778	4,479
Total current assets	288,392	185,039
Long-term marketable securities	1,000	13,996
Property and equipment, net	23,184	9,127
Goodwill	33,003	31,534
In-process research and development	15,396	14,711
Long-term deferred tax assets, net	58,534	80,306
Other assets	4,422	3,654
Total assets	423,931	338,367
Current liabilities:
Accounts payable	9,381	10,389
Accrued expenses	28,382	21,894
Deferred revenue	8,778	7,036
Total current liabilities	46,541	39,319
Other long-term liabilities	220	183
Contingent consideration	7,563	6,510
Long-term deferred tax liabilities	832	795
Total liabilities	$ 55,156	$ 46,807
Commitments and contingencies (Note 12)
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 - 43,973,119 shares at March 31, 2016 and 42,618,717 shares at March 31, 2015; Outstanding - 42,596,228 shares at March 31, 2016 and 41,335,773 shares at March 31, 2015	$ 426	$ 413
Additional paid in capital	508,624	465,046
Accumulated deficit	(99,075)	(137,222)
Treasury stock at cost - 1,376,891 shares at March 31, 2016 and 1,282,944 shares at March 31, 2015	(26,660)	(19,347)
Accumulated other comprehensive loss	(14,540)	(17,330)
Total stockholders' equity	368,775	291,560
Total liabilities and stockholders' equity	$ 423,931	$ 338,367