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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net (loss) income $ (4,364) $ 17,821
Adjustments to reconcile net loss to net cash (used in)/provided by operations:    
Depreciation and amortization 2,262 2,307
Stock-based compensation expense 646 1,610
Provision for excess and obsolete inventory 196 514
Fair Value Adjustment of Warrants (4,092) 182
Non-cash interest income (112) (112)
Other non-cash items (888) (727)
Changes in operating asset and liability accounts:    
Accounts receivable (2,244) (279)
Inventory (3,589) 1,278
Prepaid expenses and other assets (1,810) (572)
Accounts payable and accrued expenses 2,799 2,166
Deferred revenue 711 (593)
Net cash (used in)/provided by operating activities (10,485) 23,595
Cash flows from investing activities:    
Purchase of property, plant and equipment (1,736) (418)
Proceeds from the sale of property, plant and equipment 3,001 138
Purchase of marketable securities (10,000)
Change in other assets 66 (131)
Net cash used in investing activities (8,669) (411)
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (505) (396)
Proceeds from exercise of employee stock options and ESPP 100 71
Net cash used in financing activities (405) (325)
Effect of exchange rate changes on cash (74) (774)
Net (decrease)/increase in cash, cash equivalents and restricted cash (19,633) 22,085
Cash, cash equivalents and restricted cash at beginning of period 78,198 34,249
Cash, cash equivalents and restricted cash at end of period 58,565 56,334
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 130 1,438
Issuance of common stock to settle liabilities 173 172
Hercules [Member]    
Supplemental schedule of cash flow information:    
Issuance of common stock to Hercules to settle warrant liability $ 294 $ 0