CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 4,468	$ 20,165
Short-term investments	103,202	5,669
Trade accounts receivable, net	2,356	2,862
Inventories	15,306	16,278
Prepaid expenses and other current assets	2,678	7,065
Total current assets	128,010	52,039
Restricted cash	7,510	5,040
Property and equipment, net	49,286	60,156
Intangible assets, net	759	914
Deferred income taxes	616	649
Other non-current assets	4,584	5,043
Total assets	190,765	123,841
Current liabilities:
Accounts payable	2,996	5,441
Accrued compensation and benefits	4,337	5,312
Accrued expenses and other current liabilities	10,390	15,340
Current portion of deferred lease rental benefit	440	443
Current portion of capital lease obligation	469	515
Total current liabilities	18,632	27,051
Long-term debt, less current portion	120,044	85,063
Deferred lease rental benefit, less current portion	1,056	443
Capital lease obligation, less current portion	943	1,422
Defined benefit pension plan obligation	6,322	6,168
Preferred stock value	19,113	18,325
Total liabilities	166,110	138,472
Commitments and contingencies
Shareholders' equity (deficit):
Common stock value	367,679	253,934
Additional paid in capital	27,284	23,708
Accumulated other comprehensive loss	(15,877)	(16,634)
Accumulated deficit	(354,431)	(275,639)
Total shareholders' equity (deficit)	24,655	(14,631)
Total liabilities and shareholders' equity (deficit)	$ 190,765	$ 123,841