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Revenue Recognition, Statement of Cash Flows (Details) - USD ($)
 3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities [Abstract]    
Net income $ (5,014,000) $ 8,151,000
Adjustments to reconcile net income to net cash used in operating activities [Abstract]    
Depreciation 1,394,000 894,000
Amortization of intangible assets 192,000 145,000
Amortization and write-off of debt issuance costs 484,000 213,000
Amortization of interest on accrued core payments 272,000 143,000
Gain due to change in fair value of the warrant liability 0 (1,293,000)
Net provision for inventory reserves 2,367,000 1,286,000
Net provision for customer payment discrepancies (303,000) 284,000
Net recovery of doubtful accounts (23,000) (9,000)
Deferred income taxes (108,000) 209,000
Share-based compensation expense 941,000 834,000
Loss on disposal of plant and equipment 0 6,000
Changes in operating assets and liabilities, net of effects of acquisitions [Abstract]    
Accounts receivable 22,953,000 9,333,000
Inventory (28,608,000) (18,494,000)
Inventory unreturned (807,000) (120,000)
Income tax receivable (1,622,000) 1,686,000
Prepaid expenses and other current assets (697,000) (1,265,000)
Other assets 941,000 608,000
Accounts payable and accrued liabilities 11,117,000 (5,254,000)
Customer finished goods returns accrual (1,367,000) (3,790,000)
Long-term core inventory   0
Contract assets, net (2,722,000) 293,000
Contract liabilities, net (3,309,000) 3,172,000
Accrued core payments   0
Other liabilities 3,064,000 2,324,000
Net cash used in operating activities (924,000) (644,000)
Cash flows from investing activities [Abstract]    
Purchase of plant and equipment (1,546,000) (597,000)
Change in short-term investments (155,000) (173,000)
Net cash used in investing activities (1,701,000) (770,000)
Cash flows from financing activities [Abstract]    
Borrowings under revolving loan 12,200,000 17,000,000
Repayments of revolving loan (20,794,000) (13,000,000)
Repayments of term loan (782,000) (782,000)
Payments for debt issuance costs (1,722,000) (398,000)
Payments on capital lease obligations (349,000) (190,000)
Exercise of stock options 0 295,000
Cash used to net share settle equity awards (192,000) (488,000)
Repurchase of common stock, including fees 0 (1,979,000)
Net cash provided by financing activities 1,955,000 458,000
Effect of exchange rate changes on cash and cash equivalents (137,000) 47,000
Net decrease in cash and cash equivalents (807,000) (909,000)
Cash and cash equivalents - Beginning of period 13,049,000 9,029,000
Cash and cash equivalents - End of period $ 12,242,000 8,120,000
As Previously Reported [Member] | ASC 606 [Member]    
Cash flows from operating activities [Abstract]    
Net income   7,626,000
Adjustments to reconcile net income to net cash used in operating activities [Abstract]    
Depreciation   894,000
Amortization of intangible assets   145,000
Amortization and write-off of debt issuance costs   213,000
Amortization of interest on accrued core payments   143,000
Gain due to change in fair value of the warrant liability   (1,293,000)
Net provision for inventory reserves   1,286,000
Net provision for customer payment discrepancies   284,000
Net recovery of doubtful accounts   (9,000)
Deferred income taxes   (103,000)
Share-based compensation expense   834,000
Loss on disposal of plant and equipment   6,000
Changes in operating assets and liabilities, net of effects of acquisitions [Abstract]    
Accounts receivable   16,038,000
Inventory   (14,942,000)
Inventory unreturned   (120,000)
Income tax receivable   1,686,000
Prepaid expenses and other current assets   (1,265,000)
Other assets   608,000
Accounts payable and accrued liabilities   (5,254,000)
Customer finished goods returns accrual   (3,790,000)
Long-term core inventory   (2,878,000)
Contract assets, net   0
Contract liabilities, net   0
Accrued core payments   (3,077,000)
Other liabilities   2,324,000
Net cash used in operating activities   (644,000)
Cash flows from investing activities [Abstract]    
Purchase of plant and equipment   (597,000)
Change in short-term investments   (173,000)
Net cash used in investing activities   (770,000)
Cash flows from financing activities [Abstract]    
Borrowings under revolving loan   17,000,000
Repayments of revolving loan   (13,000,000)
Repayments of term loan   (782,000)
Payments for debt issuance costs   (398,000)
Payments on capital lease obligations   (190,000)
Exercise of stock options   295,000
Cash used to net share settle equity awards   (488,000)
Repurchase of common stock, including fees   (1,979,000)
Net cash provided by financing activities   458,000
Effect of exchange rate changes on cash and cash equivalents   47,000
Net decrease in cash and cash equivalents   (909,000)
Cash and cash equivalents - Beginning of period   9,029,000
Cash and cash equivalents - End of period   8,120,000
Adoption of ASU 2014-09 [Member] | ASC 606 [Member]    
Cash flows from operating activities [Abstract]    
Net income   525,000
Adjustments to reconcile net income to net cash used in operating activities [Abstract]    
Depreciation   0
Amortization of intangible assets   0
Amortization and write-off of debt issuance costs   0
Amortization of interest on accrued core payments   0
Gain due to change in fair value of the warrant liability   0
Net provision for inventory reserves   0
Net provision for customer payment discrepancies   0
Net recovery of doubtful accounts   0
Deferred income taxes   312,000
Share-based compensation expense   0
Loss on disposal of plant and equipment   0
Changes in operating assets and liabilities, net of effects of acquisitions [Abstract]    
Accounts receivable   (6,705,000)
Inventory   (3,552,000)
Inventory unreturned   0
Income tax receivable   0
Prepaid expenses and other current assets   0
Other assets   0
Accounts payable and accrued liabilities   0
Customer finished goods returns accrual   0
Long-term core inventory   2,878,000
Contract assets, net   293,000
Contract liabilities, net   3,172,000
Accrued core payments   3,077,000
Other liabilities   0
Net cash used in operating activities   0
Cash flows from investing activities [Abstract]    
Purchase of plant and equipment   0
Change in short-term investments   0
Net cash used in investing activities   0
Cash flows from financing activities [Abstract]    
Borrowings under revolving loan   0
Repayments of revolving loan   0
Repayments of term loan   0
Payments for debt issuance costs   0
Payments on capital lease obligations   0
Exercise of stock options   0
Cash used to net share settle equity awards   0
Repurchase of common stock, including fees   0
Net cash provided by financing activities   0
Effect of exchange rate changes on cash and cash equivalents   0
Net decrease in cash and cash equivalents   0
Cash and cash equivalents - Beginning of period   0
Cash and cash equivalents - End of period   $ 0