Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 35,394	$ 39,243
Accounts receivable, net	8,525	18,864
Inventory	25,167	33,473
Prepaid expenses and other current assets	19,538	22,469
Restricted cash	1,405	6,136
Total current assets	90,029	120,185
Property, plant and equipment, net	67,163	74,626
Intangibles, net	2,147	2,749
Restricted cash	4,901	4,820
Deferred tax assets	5,421	5,354
Other assets	8,710	9,020
Total assets	178,371	216,754
Current liabilities:
Accounts payable and accrued expenses	23,503	30,138
Note payable, current portion, net of discount of $677 as of December 31, 2013 and $458 as of March 31, 2013	6,272	4,158
Convertible note, current portion, net of discount of $1,287 as of December 31, 2013 and $4,289 as of March 31, 2013	9,125	4,610
Derivative liability	2,587	4,162
Adverse purchase commitments	429	1,440
Deferred revenue	10,023	29,805
Deferred tax liabilities	5,440	5,444
Total current liabilities	57,379	79,757
Note payable, net of discount of $384 as of December 31, 2013 and $95 as of March 31, 2013	7,283	3,367
Convertible note, net of discount of $600 as of March 31, 2013		5,881
Deferred revenue	1,318	1,340
Other liabilities	1,179	1,291
Total liabilities	67,159	91,636
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock	673	603
Additional paid-in capital	942,466	923,847
Treasury stock	(370)	(313)
Accumulated other comprehensive income	2,127	1,112
Accumulated deficit	(833,684)	(800,131)
Total stockholders' equity	111,212	125,118
Total liabilities and stockholders' equity	$ 178,371	$ 216,754