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Revenue Recognition - Cumulative Effect of ASU 2014-09 (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Apr. 01, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net | $ 7,622 |  | $ 7,365
Inventory | 16,235 |  | 19,780
Prepaid expenses and other current assets | 3,339 |  | 2,947
Notes receivable, long term portion | 2,776 |  | 2,559
Accounts payable and accrued expenses | (15,304) |  | (12,625)
Deferred revenue | (7,891) |  | (8,454)
Accumulated deficit | $ (970,479) |  | (988,333)
Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net |  | $ 6,687 |
Inventory |  | 18,181 |
Prepaid expenses and other current assets |  | 5,224 |
Notes receivable, long term portion |  | 2,664 |
Accounts payable and accrued expenses |  | (15,354) |
Deferred revenue |  | (10,826) |
Accumulated deficit |  | $ (988,366) |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net |  |  | (678)
Inventory |  |  | (1,599)
Prepaid expenses and other current assets |  |  | 2,277
Notes receivable, long term portion |  |  | 105
Accounts payable and accrued expenses |  |  | (2,729)
Deferred revenue |  |  | 2,657
Accumulated deficit |  |  | (33)
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net |  |  | 7,365
Inventory |  |  | 19,780
Prepaid expenses and other current assets |  |  | 2,947
Notes receivable, long term portion |  |  | 2,559
Accounts payable and accrued expenses |  |  | (12,625)
Deferred revenue |  |  | (13,483)
Accumulated deficit |  |  | $ (988,333)

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