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RESTATEMENT - Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | --- | --- | ---
Current Assets |  |  |  |
Cash and cash equivalents | $ 5,704 | $ 10,865 | $ 13,983 |
Accounts receivable, | 76,304 | 96,350 | 99,226 |
Manufacturing inventories | 21,084 | 34,428 | 34,712 |
Service part inventories | 18,642 | 21,889 | 19,915 |
Other current assets | 11,291 | 13,565 | 9,581 |
Restricted cash | 6,124 | 1,342 | 3,063 |
Total current assets | 139,149 | 178,439 | 180,480 |
Property and equipment, less accumulated depreciation | 8,925 | 9,698 | 10,420 |
Restricted cash, long-term |  | 5,000 | 20,000 |
Other long-term assets | 6,120 | 9,502 | 6,750 |
Total assets | 154,194 | 202,639 | 217,650 |
Current liabilities: |  |  |  |
Accounts payable | 45,021 | 62,646 | 48,488 |
Deferred revenue, current | 89,020 | 96,866 | 88,505 |
Accrued restructuring charges, current | 4,437 | 3,166 | 2,370 |
Convertible subordinated debt, current |  |  | 57,034 |
Accrued compensation | 15,559 | 19,460 | 22,255 |
Other accrued liabilities | 29,150 | 17,638 | 16,561 |
Total current liabilities | 310,701 | 207,276 | 235,213 |
Deferred revenue, long-term | 34,577 | 38,587 | 36,774 |
Accrued restructuring charges, long-term |  | 2,653 | 3,615 |
Long-term debt, net of current portion |  | 115,986 | 76,491 |
Other long-term liabilities | 10,564 | 11,604 | 11,036 |
Total liabilities | 355,842 | 376,106 | 363,129 |
Commitment and contingencies (Note 12) |  |  |  |
Stockholders' deficit |  |  |  |
Common stock | 356 | 354 | 347 |
Additional paid-in capital |  |  | 476,093 |
Accumulated deficit | (684,257) | (655,157) | (621,029) |
Accumulated other comprehensive income (loss) | (1,243) | (274) | (890) |
Total stockholders' deficit | (201,648) | (173,467) | (145,479) | $ (139,296)
Total liabilities and stockholders' deficit | $ 154,194 | $ 202,639 | 217,650 |
Previously Reported [Member] |  |  |  |
Current Assets |  |  |  |
Cash and cash equivalents |  |  | 9,504 |
Accounts receivable, |  |  | 105,771 |
Manufacturing inventories |  |  | 29,119 |
Service part inventories |  |  | 19,915 |
Other current assets |  |  | 8,795 |
Restricted cash |  |  | 1,969 |
Total current assets |  |  | 175,073 |
Property and equipment, less accumulated depreciation |  |  | 10,745 |
Restricted cash, long-term |  |  | 20,000 |
Other long-term assets |  |  | 5,332 |
Total assets |  |  | 211,150 |
Current liabilities: |  |  |  |
Accounts payable |  |  | 48,488 |
Accrued warranty |  |  | 2,950 |
Deferred revenue, current |  |  | 77,090 |
Accrued restructuring charges, current |  |  | 1,743 |
Convertible subordinated debt, current |  |  | 57,034 |
Accrued compensation |  |  | 23,180 |
Other accrued liabilities |  |  | 12,927 |
Total current liabilities |  |  | 223,412 |
Deferred revenue, long-term |  |  | 35,906 |
Accrued restructuring charges, long-term |  |  | 423 |
Long-term debt, net of current portion |  |  | 70,631 |
Other long-term liabilities |  |  | 5,112 |
Total liabilities |  |  | 335,484 |
Commitment and contingencies (Note 12) |  |  |  |
Stockholders' deficit |  |  |  |
Common stock |  |  | 347 |
Additional paid-in capital |  |  | 476,409 |
Accumulated deficit |  |  | (604,832) |
Accumulated other comprehensive income (loss) |  |  | 3,742 |
Total stockholders' deficit |  |  | (124,334) |
Total liabilities and stockholders' deficit |  |  | 211,150 |
Restatement Adjustment [Member] |  |  |  |
Current Assets |  |  |  |
Cash and cash equivalents |  |  | 4,479 |
Accounts receivable, |  |  | (6,545) |
Manufacturing inventories |  |  | 5,593 |
Other current assets |  |  | 786 |
Restricted cash |  |  | 1,094 |
Total current assets |  |  | 5,407 |
Property and equipment, less accumulated depreciation |  |  | (325) |
Other long-term assets |  |  | 1,418 |
Total assets |  |  | 6,500 |
Current liabilities: |  |  |  |
Accrued warranty |  |  | (2,950) |
Deferred revenue, current |  |  | 11,415 |
Accrued restructuring charges, current |  |  | 627 |
Accrued compensation |  |  | (925) |
Other accrued liabilities |  |  | 3,634 |
Total current liabilities |  |  | 11,801 |
Deferred revenue, long-term |  |  | 868 |
Accrued restructuring charges, long-term |  |  | 3,192 |
Long-term debt, net of current portion |  |  | 5,860 |
Other long-term liabilities |  |  | 5,924 |
Total liabilities |  |  | 27,645 |
Commitment and contingencies (Note 12) |  |  |  |
Stockholders' deficit |  |  |  |
Additional paid-in capital |  |  | (316) |
Accumulated deficit |  |  | (16,197) |
Accumulated other comprehensive income (loss) |  |  | (4,632) |
Total stockholders' deficit |  |  | (21,145) |
Total liabilities and stockholders' deficit |  |  | $ 6,500 |

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