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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:      
Net income (loss) $ (21,505) $ (10,337) $ 163
Adjustments to reconcile net income (loss) to net cash provided by (used) in operating activities:      
Allowance for doubtful accounts and other 35 (17) 39
Provision for excess and obsolete inventories 466 343 1,195
Non-cash lease expense 598 611  
Depreciation and amortization 1,214 1,434 1,454
Stock-based compensation 2,854 2,566 2,266
Amortization of premium (discount) on investments 88   (36)
Changes in assets and liabilities:      
Accounts receivable 2,630 1,026 (2,099)
Inventory (527) 1,060 (1,333)
Prepaid expenses and other assets 440 (431) (144)
Accounts payable 383 (680) 48
Accrued expenses and other liabilities (1,928) (256) 1,453
Net cash provided by (used in) operating activities (15,252) (4,681) 3,006
Cash flows from investing activities:      
Purchase of investments (17,510) (18,116) (20,307)
Maturities of short-term investments 21,000 27,418 18,173
Decrease in MikaMonu escrow deposit   1,000 750
Purchases of property and equipment (203) (331) (2,090)
Net cash provided by (used in) investing activities 3,287 9,971 (3,474)
Cash flows from financing activities:      
Payment of contingent consideration     (720)
Payment of MikaMonu escrow deposit   (428) (364)
Repurchase of common stock     (103)
Proceeds from issuance of common stock under employee stock plans 4,693 4,149 3,909
Net cash provided by financing activities 4,693 3,721 2,722
Net increase (decrease) in cash and cash equivalents (7,272) 9,011 2,254
Cash and cash equivalents at beginning of the period 51,506 42,495 40,241
Cash and cash equivalents at end of the period 44,234 51,506 42,495
Non-cash financing activities:      
Purchases of property and equipment through accounts payable and accruals 6 19 31
Operating lease right-of-use assets exchanged for lease obligations 658 1,228  
Supplemental cash flow information:      
Net cash paid for income taxes $ 858 $ 345 $ 11