Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net loss	$ (16,819)	$ (38,939)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	4,009	4,901
Stock-based compensation expense	1,834	3,099
Impairment of long-lived and intangible assets	746	3,464
Provision for excess and obsolete inventory	829	1,285
Write-off prepaid taxes	511
Loss on minority interest investments	356	410
Change in fair value of derivatives and warrants	(1,501)	(760)
Non-cash interest expense	207	343
Other non-cash items	921	(860)
Changes in operating asset and liability accounts:
Accounts receivable	(1,196)	(2,264)
Inventory	3,478	(5,283)
Prepaid expenses and other current assets	2,957	(1,533)
Accounts payable and accrued expenses	(3,337)	4,154
Accrued arbitration liability		10,188
Deferred revenue	(762)	10,426
Net cash used in operating activities	(7,767)	(11,369)
Cash flows from investing activities:
Purchase of property, plant and equipment	(310)	(514)
Proceeds from the sale of property, plant and equipment	7	8
Change in restricted cash	(16)	2,782
Change in other assets	91	(12)
Net cash (used in) provided by investing activities	(228)	2,264
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(109)	(400)
Repayment of debt	(2,000)	(3,641)
Proceeds from public equity offering, net	22,281	4,825
Proceeds from exercise of employee stock options and ESPP	30	60
Net cash provided by financing activities	20,202	844
Effect of exchange rate changes on cash and cash equivalents	(125)	(174)
Net increase/(decrease) in cash and cash equivalents	12,082	(8,435)
Cash and cash equivalents at beginning of year	20,490	43,114
Cash and cash equivalents at end of year	32,572	34,679
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	758	226
Issuance of common stock to settle liabilities	197	1,528
Cash paid for interest	$ 391	$ 684