Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (4,737)	$ (15,252)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	1,150	4,345
Stock-based compensation expense	785	754
Provision for excess and obsolete inventory	144	250
Change in fair value of warrants	464	(925)
Non-cash interest expense	(56)	19
Other non-cash items	(394)	718
Changes in operating asset and liability accounts:
Accounts receivable	(4,192)	319
Inventory	(459)	1,719
Prepaid expenses and other current assets	(332)	(273)
Accounts payable and accrued expenses	75	(404)
Deferred revenue	666	3,300
Net cash used in operating activities	(6,886)	(5,430)
Cash flows from investing activities:
Purchase of property, plant and equipment	(115)	(76)
Proceeds from the sale of property, plant and equipment	0	10
Change in other assets	(51)	(23)
Net cash used in investing activities	(166)	(89)
Cash flows from financing activities:
Employee taxes paid related to net settlement of equity awards	(238)	(274)
Repayment of debt	0	(1,575)
Proceeds from public equity offering, net	0	16,954
Net cash provided by/(used in) financing activities	(238)	15,105
Effect of exchange rate changes on cash	(44)	412
Net increase/(decrease) in cash, cash equivalents and restricted cash	(7,334)	9,998
Cash, cash equivalents and restricted cash at beginning of period	34,249	27,744
Cash, cash equivalents and restricted cash at end of period	26,915	37,742
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	176	96
Issuance of common stock to settle liabilities	85	90
Cash paid for interest	$ 0	$ 42