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	$ (8,767)	$ (8,491)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	251	135
Change in fair value of warrant liabilities	5	38
Stock-based compensation	1,429	1,780
Amortization of warrants issued for services	0	(95)
Increase (decrease) in cash resulting from changes in:
Accounts receivable	156	(132)
Inventory	(178)	(3)
Prepaid expenses and other assets	(41)	256
Accounts payable	(306)	(357)
Accrued expenses	(735)	(611)
Deferred rent	(36)	(8)
Deferred revenue	(319)	1,193
Net cash used in operating activities	(8,541)	(6,295)
Cash Flows From Investing Activities
Purchases of fixed assets	(12)	(1,135)
Net cash used in investing activities	(12)	(1,135)
Cash Flows From Financing Activities
Proceeds from issuance of common stock and exercise of warrants, net	0	43,214
Proceeds from exercise of stock options	0	77
Principal payments on capital lease obligations	0	(3)
Net cash provided by financing activities	0	43,288
Net Increase (Decrease) in Cash and Cash Equivalents	(8,553)	35,858
Cash and Cash Equivalents at Beginning of Period	62,091	50,142
Cash and Cash Equivalents at End of Period	53,538	86,000
Supplemental Disclosure of Cash Flow Information:
Interest paid	0	0
Income taxes paid	$ 22	$ 3