Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (27,373)	$ (23,139)	$ (48,656)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	7,519	7,972	9,554
Stock-based compensation expense	2,892	3,248	5,936
Impairment of minority interest investments	0	746	3,464
Provision for excess and obsolete inventory	1,615	2,713	1,386
Write-off prepaid taxes	0	289	0
Gain on sale from minority interest investments	(325)	(3,092)	0
Loss from minority interest investments	0	356	743
Change in fair value of derivatives and warrants	(1,304)	228	(3,963)
Reversal of Catlin legal costs	0	0	(2,220)
Non-cash interest expense	156	359	566
Other non-cash items	(940)	1,462	(2,436)
Changes in operating asset and liability accounts:
Accounts receivable	11,143	(9,318)	(2,677)
Inventory	(815)	(782)	(1,887)
Prepaid expenses and other current assets	2,729	5,608	(2,330)
Accounts payable and accrued expenses	(7,938)	1,543	5,579
Deferred revenue	1,426	7,248	4,265
Net cash used in operating activities	(11,215)	(4,559)	(32,676)
Cash flows from investing activities:
Purchase of property, plant and equipment	(656)	(1,201)	(737)
Proceeds from the sale of property, plant and equipment	29	47	18
Change in restricted cash	431	2,669	2,248
Proceeds from sale of minority interests	325	3,092	0
Change in other assets	63	266	280
Net cash provided by investing activities	192	4,873	1,809
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(490)	(110)	(401)
Proceeds from the issuance of debt, net of expenses	0	0	1,422
Repayment of debt	(3,167)	(4,000)	(7,295)
Proceeds from ATM sales, net	2,527	0	5,839
Proceeds from public equity offering, net	0	22,282	9,094
Proceeds from exercise of employee stock options and ESPP	0	30	124
Net cash (used in) provided by financing activities	(1,130)	18,202	8,783
Effect of exchange rate changes on cash and cash equivalents	(393)	324	(540)
Net (decrease)/increase in cash and cash equivalents	(12,546)	18,840	(22,624)
Cash and cash equivalents at beginning of year	39,330	20,490	43,114
Cash and cash equivalents at end of year	26,784	39,330	20,490
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	992	1,723	362
Issuance of common stock to settle liabilities	399	377	1,715
Cash paid for interest	$ 280	$ 709	$ 1,362