CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
ASSETS
Cash and cash equivalents	$ 40,241	$ 33,736
Short-term investments	18,124	16,199
Accounts receivable, net	5,279	6,349
Inventories	5,547	9,211
Prepaid expenses and other current assets	2,080	2,777
Total current assets	71,271	68,272
Property and equipment, net	8,172	7,689
Long-term investments	7,923	12,898
Goodwill	7,978	7,978
Intangible assets, net	2,989	3,302
Other assets	1,207	2,456
Total assets	99,540	102,595
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	1,841	1,627
Accrued expenses and other liabilities	5,442	7,051
Deferred revenue	121	1,796
Total current liabilities	7,404	10,474
Income taxes payable	619	244
Deferred income taxes		15
Other accrued expenses	4,702	5,418
Total liabilities	12,725	16,151
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock: $0.001 par value authorized: 5,000,000 shares; issued and outstanding: none
Common Stock: $0.001 par value authorized: 150,000,000 shares; issued and outstanding: 21,407,247 and 20,612,757 shares, respectively	21	21
Additional paid-in capital	27,391	21,830
Accumulated other comprehensive loss	(142)	(62)
Retained earnings	59,545	64,655
Total stockholders' equity	86,815	86,444
Total liabilities and stockholders' equity	$ 99,540	$ 102,595