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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 $ (38,447) $ (38,575) $ (30,082)
Adjustments to reconcile net loss to net cash used in operating activities:      
Amortization of warrants issued for services 0 (92) 557
Depreciation and amortization 1,149 815 472
Loss on disposal of fixed assets 56 0 12
Change in fair value of warrant liabilities (4) 17 (196)
Stock-based compensation 7,392 8,556 7,020
Increase (decrease) in cash resulting from changes in:      
Accounts receivable (388) (259) 0
Inventory (216) (268) (3)
Prepaid expenses and other assets (154) 83 (389)
Accounts payable 384 (600) 1,061
Accrued expenses 1,651 193 1,435
Deferred rent (138) (89) 270
Deferred revenue (470) 851 242
Net cash used in operating activities (29,185) (29,368) (19,601)
Cash Flows From Investing Activities      
Deposits released from restriction (restricted cash deposits) (48) 0 0
Purchases of fixed assets (1,354) (2,114) (1,517)
Proceeds from disposals of fixed assets 11 14 0
Purchases of intangible assets 0 (35) 0
Net cash used in investing activities (1,391) (2,135) (1,517)
Cash Flows From Financing Activities      
Proceeds from issuance of common stock and exercise of warrants, net 30,665 43,137 22,752
Proceeds from exercise of stock options 582 320 351
Principal payments on capital lease obligations 0 (5) (10)
Net cash provided by financing activities 31,247 43,452 23,093
Effect of currency exchange rate changes on cash and cash equivalents (11) 0 0
Net Increase in Cash and Cash Equivalents 660 11,949 1,975
Cash and Cash Equivalents at Beginning of Period 62,091 50,142 48,167
Cash and Cash Equivalents at End of Period 62,751 62,091 50,142
Supplemental Disclosure of Cash Flow Information:      
Income Taxes $ 23 $ 3 $ 4