CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Current assets:
Cash and cash equivalents	$ 6,528	$ 4,096
Short-term investments	84,151	90,729
Trade accounts receivable, net	4,724	3,348
Inventories	16,712	15,551
Prepaid expenses and other current assets	3,326	3,202
Total current assets	115,441	116,926
Restricted cash	9,016	7,507
Property and equipment, net	45,506	47,293
Operating lease right-of-use assets	17,615
Intangible assets, net	707	751
Deferred income taxes	592	605
Other non-current assets	4,568	4,688
Total assets	193,445	177,770
Current liabilities:
Accounts payable	5,342	5,936
Accrued compensation and benefits	4,372	6,149
Accrued expenses and other current liabilities	9,441	12,458
Current portion of operating lease liability	2,723
Current portion of deferred lease rental benefit		435
Current portion of finance lease obligation	457	471
Total current liabilities	22,335	25,449
Long-term debt, less current portion	148,088	121,855
Operating lease liability, less current portion	16,176
Deferred lease rental benefit, less current portion		1,144
Finance lease obligation, less current portion	753	865
Defined benefit pension plan obligation	7,647	7,368
7% Cumulative redeemable preference shares	19,638	19,375
Total liabilities	214,637	176,056
Commitments and contingencies
Shareholders' equity (deficit):
Common stock value	369,021	368,958
Additional paid in capital	29,843	28,665
Accumulated other comprehensive loss	(15,823)	(14,884)
Accumulated deficit	(404,233)	(381,025)
Total shareholders' equity (deficit)	(21,192)	1,714
Total liabilities and shareholders' equity (deficit)	$ 193,445	$ 177,770