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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:      
Net income (loss) $ 1,349 $ 7,484 $ (2,962)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 12,990 9,428 9,471
Stock-based compensation 5,525 4,212 1,672
Impairment loss on goodwill and long-lived assets 298 4,774 13,819
Loss (gain) on disposition of assets 34 (288) (116)
Non-cash interest and debt amortization 3,314    
Amortization of step-up in inventory basis 8,502    
Change in inventory reserve (360) (380) 2,474
Deferred taxes (1,971) (2,472) (2,704)
Adjustment to contingent consideration (62) (32) 300
Other 77 (63) (380)
Cash (used in) provided by changes in operating assets and liabilities      
Accounts receivable, net (1,665) 1,592 680
Inventories, net 414 2,574 2,286
Prepaid expenses and other assets (432) (2,898) 755
Accounts payable (61) 1,092 212
Accrued liabilities and taxes payable (2,147) 5,477 408
Unearned revenues 754 54 (196)
Net cash provided by operating activities 26,559 30,554 25,719
Cash flows from investing activities:      
Acquisitions (184,102) (4,840) (15,518)
Purchases of property, plant and equipment (1,498) (1,262) (2,799)
Proceeds from sale of assets 15 2,222 1,133
Net cash (used in) investing activities (185,585) (3,880) (17,184)
Cash flows from financing activities:      
Proceeds from the issuance of debt   2,000 11,000
Proceeds from the issuance of convertible senior notes 172,500    
Payment of debt issuance costs (5,430)    
Proceeds from the issuance of common stock, net 84,995    
Payments of debt (23,000) (25,625) (19,625)
Dividends (2,722) (2,462) (2,413)
Payments of Contingent Consideration (11) (680) (905)
Proceeds from the exercise of stock options 4,945 5,095 2,919
Net cash provided by (used in) financing activities 231,277 (21,672) (9,024)
Effect of exchange rate changes on cash and cash equivalents (1,056) (286) 138
Net increase (decrease) in cash and cash equivalents 71,195 4,716 (351)
Cash and cash equivalents at beginning of year 10,185 5,469 5,820
Cash and cash equivalents at end of year 81,380 10,185 5,469
Supplemental non-cash activity:      
Deferred tax liability related to the conversion option associated with the convertible senior notes 7,359    
Contingent consideration as part of an acquisition 490    
Cash paid for:      
Income taxes paid 2,634 5,870 4,551
Interest paid $ 1,627 $ 1,637 $ 1,956