CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 53,226	$ 22,401
Short-term marketable securities	142,968	109,557
Accounts receivable, net	36,842	31,828
Inventories	25,535	16,774
Prepaid expenses and other current assets	4,115	4,479
Deferred tax assets, net	19,059	35,100
Total current assets	281,745	220,139
Long-term marketable securities		13,996
Property and equipment, net	15,020	9,127
Goodwill	31,697	31,534
In-process research and development	14,786	14,711
Long-term deferred tax assets, net	43,956	45,206
Other assets	4,422	3,654
Total assets	391,626	338,367
Current liabilities:
Accounts payable	8,836	10,389
Accrued expenses	21,921	21,894
Deferred revenue	6,913	7,036
Total current liabilities	37,670	39,319
Other long-term liabilities	236	183
Contingent consideration	7,392	6,510
Long-term deferred tax liabilities	799	795
Total liabilities	$ 46,097	$ 46,807
Commitments and contingencies (Note 10)
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 - 43,777,675 shares at December 31, 2015 and 42,618,717 shares at March 31, 2015; Outstanding - 42,437,354 shares at December 31, 2015 and 41,335,773 shares at March 31, 2015	$ 424	$ 413
Additional paid in capital	495,991	465,046
Accumulated deficit	(110,073)	(137,222)
Treasury stock at cost - 1,340,321 shares at December 31, 2015 and 1,282,944 shares at March 31, 2015	(23,255)	(19,347)
Accumulated other comprehensive loss	(17,558)	(17,330)
Total stockholders' equity	345,529	291,560
Total liabilities and stockholders' equity	$ 391,626	$ 338,367