Accounts receivable as of January 31, 2016 and October 31, 2015 consisted of the following: | | | | | | | | | | January 31, 2016 | | October 31, 2015 | Commercial Customers: | | | | Amount billed | $ | 10,753 |
| | $ | 19,331 |
| Unbilled recoverable costs | 30,651 |
| | 37,949 |
| | 41,404 |
| | 57,280 |
| Advanced Technology (including U.S. Government(1)): | | | | Amount billed | 643 |
| | 433 |
| Unbilled recoverable costs | 3,349 |
| | 3,077 |
| | 3,992 |
| | 3,510 |
| Accounts receivable, net | $ | 45,396 |
| | $ | 60,790 |
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| | (1) | Total U.S. Government accounts receivable outstanding as of January 31, 2016 and October 31, 2015 was $2.9 million and $2.6 million, respectively. |
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