Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (10,355)	$ (9,121)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	1,871	2,028
Stock-based compensation expense	999	1,128
Impairment of minority interest investment	0	746
Provision for excess and obsolete inventory	272	602
Write-off prepaid taxes	0	820
Loss from minority interest investment	0	356
Change in fair value of derivatives and warrants	678	(800)
Non-cash interest expense	56	111
Other non-cash items	(307)	553
Changes in operating asset and liability accounts:
Accounts receivable	12,192	1,414
Inventory	(10,750)	2,968
Prepaid expenses and other current assets	1,555	271
Accounts payable and accrued expenses	1,650	(3,024)
Deferred revenue	79	(1,087)
Net cash used in operating activities	(2,060)	(3,035)
Cash flows from investing activities:
Purchase of property, plant and equipment	(281)	(197)
Proceeds from the sale of property, plant and equipment	15	7
Change in restricted cash	16	(4)
Change in other assets	(21)	130
Net cash used in investing activities	(271)	(64)
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(461)	(98)
Repayment of debt	(1,000)	(1,000)
Proceeds from public equity offering, net	0	22,281
Net cash (used in) / provided by financing activities	(1,461)	21,183
Effect of exchange rate changes on cash and cash equivalents	(327)	(13)
Net (decrease) / increase in cash and cash equivalents	(4,119)	18,071
Cash and cash equivalents at beginning of period	39,330	20,490
Cash and cash equivalents at end of period	35,211	38,561
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	112	329
Issuance of common stock to settle liabilities	107	107
Cash paid for interest	$ 108	$ 220