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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (3,539) $ (4,737)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 1,149 1,150
Stock-based compensation expense 249 785
Provision for excess and obsolete inventory 89 144
Change in fair value of warrants (2,946) 464
Non-cash interest income (112) (56)
Other non-cash items 100 (394)
Changes in operating asset and liability accounts:    
Accounts receivable (2,874) (4,192)
Inventory 108 (459)
Prepaid expenses and other assets (1,002) (332)
Accounts payable and accrued expenses (181) 75
Deferred revenue 3,093 666
Net cash used in operating activities (5,866) (6,886)
Cash flows from investing activities:    
Purchase of property, plant and equipment (836) (115)
Proceeds from the sale of property, plant and equipment 3,001
Change in other assets 94 (51)
Net cash provided by/(used in) investing activities 2,259 (166)
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (283) (238)
Net cash used in financing activities (283) (238)
Effect of exchange rate changes on cash 359 (44)
Net decrease in cash, cash equivalents and restricted cash (3,531) (7,334)
Cash, cash equivalents and restricted cash at beginning of period 78,198 34,249
Cash, cash equivalents and restricted cash at end of period 74,667 26,915
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 128 176
Issuance of common stock to settle liabilities 81 85
Hercules [Member]    
Supplemental schedule of cash flow information:    
Issuance of common stock to Hercules to settle warrant liability $ 294