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Consolidated Balance Sheets (Parenthetical) - USD ($) | Sep. 30, 2020 | Mar. 31, 2020
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 4,656,000 | $ 4,059,000
Short-term debt issuance costs | 62,000 | 62,000
Long-term debt, issuance costs and discounts | $ 214,000 | $ 245,000
Series A convertible preferred stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001
Series A convertible preferred stock, shares authorized | 2,000,000 | 2,000,000
Series A convertible preferred stock, shares issued | 100,000 | 100,000
Series A convertible preferred stock, shares outstanding | 100,000 | 100,000
Series A convertible preferred stock, liquidation preference | $ 1,000,000 | $ 1,000,000
Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001
Common stock, shares authorized | 200,000,000 | 200,000,000
Common stock, shares issued | 89,431,559 | 88,041,240
Common stock, shares outstanding | 88,697,103 | 87,306,784
Treasury stock (in shares) | 754,599 | 754,599

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