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Accounts Receivable | 6 Months Ended
--- | ---
Sep. 30, 2013
Accounts Receivable | 5. Accounts Receivable Accounts receivable at September 30, 2013 and March 31, 2013 consisted of the following (in thousands):
| September 30, 2013 |  |  | March 31, 2013 |
--- | --- | --- | --- | --- | ---
Accounts receivable (billed) | $ |  | 8,592 |  |  | $ |  | 17,222 |
Accounts receivable (unbilled) |  | 713 |  |  |  | 1,642 |
Less: Allowance for doubtful accounts |  | (16 | ) |  |  | — |
Accounts receivable, net | $ |  | 9,289 |  |  | $ |  | 18,864 |

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