Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 26,784	$ 39,330
Accounts receivable, net	7,956	19,264
Inventory	17,462	18,512
Prepaid expenses and other current assets	2,703	5,778
Restricted cash	795	457
Total current assets	55,700	83,341
Property, plant and equipment, net	43,438	49,778
Intangibles, net	301	854
Restricted cash	165	934
Deferred tax assets	407	96
Other assets	233	315
Total assets	100,244	135,318
Current liabilities:
Accounts payable and accrued expenses	14,490	23,156
Note payable, current portion, net of discount of $19 as of March 31, 2017 and $42 as of March 31, 2016	1,481	2,624
Derivative liabilities	1,923	3,227
Deferred revenue	14,323	12,000
Total current liabilities	32,217	41,007
Note payable, net of discount of $133 as of March 31, 2016	0	1,367
Deferred revenue	7,631	9,269
Deferred tax liabilities	125	63
Other liabilities	45	63
Total liabilities	40,018	51,769
Commitments and contingencies
Common stock, $0.01 par value, 75,000,000 shares authorized; 14,713,839 and 14,107,126 shares issued at March 31, 2017 and 2016, respectively
Common stock, $0.01 par value, 75,000,000 shares authorized; 14,713,839 and 14,107,126 shares issued at March 31, 2017 and 2016, respectively	147	141
Additional paid-in capital	1,017,510	1,011,813
Treasury stock, at cost, 97,529 and 51,506 shares at March 31, 2017 and 2016, respectively	(1,371)	(881)
Accumulated other comprehensive (loss) income	(503)	660
Accumulated deficit	(955,557)	(928,184)
Total stockholders' equity	60,226	83,549
Total liabilities and stockholders' equity	$ 100,244	$ 135,318